ALTER DATABASE test CHARACTER SET latin1 COLLATE latin1_swedish_ci; SET DEFAULT_STORAGE_ENGINE = MyISAM; set @optimizer_switch_save= @@optimizer_switch; set optimizer_switch='rowid_filter=off'; set optimizer_switch='index_merge_sort_intersection=off';
#---------------- Index merge test 1 -------------------------------------------
create table t0
(
key1 int not null,
INDEX i1(key1)
);
insert into t0(key1) select seq from seq_1_to_1024;
alter table t0 add key2 int not null, add index i2(key2);
alter table t0 add key3 int not null, add index i3(key3);
alter table t0 add key4 int not null, add index i4(key4);
alter table t0 add key5 int not null, add index i5(key5);
alter table t0 add key6 int not null, add index i6(key6);
alter table t0 add key7 int not null, add index i7(key7);
alter table t0 add key8 int not null, add index i8(key8);
update t0 set key2=key1,key3=key1,key4=key1,key5=key1,key6=key1,key7=key1,key8=1024-key1;
analyze table t0;
Table Op Msg_type Msg_text
test.t0 analyze status Engine-independent statistics collected
test.t0 analyze status OK
explain select * from t0 where key1 < 3or key1 > 920and key1 < 924;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 range i1 i1 4 NULL 5 Using index condition
explain
select * from t0 where key1 < 3or key2 > 920and key2 < 924;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 5 Using sort_union(i1,i2); Using where
select * from t0 where key1 < 3or key2 > 920and key2 < 924;
key1 key2 key3 key4 key5 key6 key7 key8 11111111023 22222221022 921921921921921921921103 922922922922922922922102 923923923923923923923101
select * from t0 where key1=1022;
key1 key2 key3 key4 key5 key6 key7 key8 10221022102210221022102210222
explain select * from t0 where key1 < 3or key2 <4;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 5 Using sort_union(i1,i2); Using where
explain
select * from t0 where (key1 > 30and key1<35) or (key2 >32and key2 < 40);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 11 Using sort_union(i1,i2); Using where
select * from t0 where (key1 > 30and key1<35) or (key2 >32and key2 < 40);
key1 key2 key3 key4 key5 key6 key7 key8 31313131313131993 32323232323232992 33333333333333991 34343434343434990 35353535353535989 36363636363636988 37373737373737987 38383838383838986 39393939393939985
explain select * from t0 ignore index (i2) where key1 < 3or key2 <4;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 ALL i1 NULL NULL NULL 1024 Using where
explain select * from t0 where (key1 < 3or key2 <4) and key3 = 50;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 ref i1,i2,i3 i3 4 const 1 Using where
explain select * from t0 use index (i1,i2) where (key1 < 3or key2 <4) and key3 = 50;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 5 Using sort_union(i1,i2); Using where
explain select * from t0 where (key1 > 1or key2 > 2);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 ALL i1,i2 NULL NULL NULL 1024 Using where
explain select * from t0 force index (i1,i2) where (key1 > 1or key2 > 2);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 1024 Using sort_union(i1,i2); Using where
explain
select * from t0 where key1<3or key2<3or (key1>5and key1<8) or
(key1>10and key1<12) or (key2>100and key2<110);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 15 Using sort_union(i1,i2); Using where
explain select * from t0 where key2 = 45or key1 <=> null;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 range i1,i2 i2 4 NULL 1 Using index condition
explain select * from t0 where key2 = 45or key1 is not null;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 ALL i1,i2 NULL NULL NULL 1024 Using where
explain select * from t0 where key2 = 45or key1 is null;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 ref i2 i2 4 const 1
explain select * from t0 where key2=10or key3=3or key4 <=> null;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i2,i3,i4 i2,i3 4,4 NULL 2 Using union(i2,i3); Using where
explain select * from t0 where key2=10or key3=3or key4 is null;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i2,i3 i2,i3 4,4 NULL 2 Using union(i2,i3); Using where
explain select key1 from t0 where (key1 <=> null) or (key2 < 5) or
(key3=10) or (key4 <=> null);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2,i3,i4 i2,i3 4,4 NULL 5 Using sort_union(i2,i3); Using where
explain select key1 from t0 where (key1 <=> null) or (key1 < 5) or
(key3=10) or (key4 <=> null);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i3,i4 i1,i3 4,4 NULL 5 Using sort_union(i1,i3); Using where
explain select * from t0 where
(key1 < 3or key2 < 3) and (key3 < 4or key4 < 4) and (key5 < 5or key6 < 5);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2,i3,i4,i5,i6 i1,i2 4,4 NULL 4 Using sort_union(i1,i2); Using where
explain
select * from t0 where (key1 < 3or key2 < 6) and (key1 < 7or key3 < 4);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2,i3 i1,i2 4,4 NULL 7 Using sort_union(i1,i2); Using where
select * from t0 where (key1 < 3or key2 < 6) and (key1 < 7or key3 < 4);
key1 key2 key3 key4 key5 key6 key7 key8 11111111023 22222221022 33333331021 44444441020 55555551019
explain select * from t0 where
(key1 < 3or key2 < 3) and (key3 < 4or key4 < 4) and (key5 < 2or key6 < 2);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2,i3,i4,i5,i6 i5,i6 4,4 NULL 2 Using sort_union(i5,i6); Using where
explain select * from t0 where
(key1 < 3or key2 < 3) and (key3 < 100);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2,i3 i1,i2 4,4 NULL 4 Using sort_union(i1,i2); Using where
explain select * from t0 where
(key1 < 3or key2 < 3) and (key3 < 1000);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2,i3 i1,i2 4,4 NULL 4 Using sort_union(i1,i2); Using where
explain select * from t0 where
((key1 < 4or key2 < 4) and (key2 <5or key3 < 4)) or
key2 > 5;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 ALL i1,i2,i3 NULL NULL NULL 1024 Using where
explain select * from t0 where
((key1 < 4or key2 < 4) and (key2 <5or key3 < 4)) or
key1 < 7;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2,i3 i1,i2 4,4 NULL 8 Using sort_union(i1,i2); Using where
select * from t0 where
((key1 < 4or key2 < 4) and (key2 <5or key3 < 4)) or
key1 < 7;
key1 key2 key3 key4 key5 key6 key7 key8 11111111023 22222221022 33333331021 44444441020 55555551019 66666661018
select count(*) from t0 where
((key1 < 4or key2 < 4) and (key3 <5or key5 < 4)) or
((key5 < 5or key6 < 6) and (key7 <7or key8 < 4));
count(*) 5
explain select * from t0 where
((key1 < 4or key2 < 4) and (key3 <5or key5 < 4)) or
((key5 < 5or key6 < 6) and (key7 <7or key8 < 4));
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2,i3,i5,i6,i7,i8 i1,i2,i5,i6 4,4,4,4 NULL 15 Using sort_union(i1,i2,i5,i6); Using where
explain select * from t0 where
((key3 <5or key5 < 4) and (key1 < 4or key2 < 4)) or
((key7 <7or key8 < 4) and (key5 < 5or key6 < 6));
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2,i3,i5,i6,i7,i8 i3,i5,i7,i8 4,4,4,4 NULL 16 Using sort_union(i3,i5,i7,i8); Using where
explain select * from t0 where
((key3 <5or key5 < 4) and (key1 < 4or key2 < 4)) or
((key3 <7or key5 < 2) and (key5 < 5or key6 < 6));
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2,i3,i5,i6 i3,i5 4,4 NULL 9 Using sort_union(i3,i5); Using where
explain select * from t0 where
((key3 <5or key5 < 4) and (key1 < 4or key2 < 4)) or
(((key3 <7and key7 < 6) or key5 < 2) and (key5 < 5or key6 < 6));
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2,i3,i5,i6,i7 i3,i5 4,4 NULL 9 Using sort_union(i3,i5); Using where
explain select * from t0 where
((key3 < 4or key5 < 4) and (key1 < 4or key2 < 4)) or
((key3 >=5or key5 < 2) and (key5 < 5or key6 < 6));
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 ALL i1,i2,i3,i5,i6 NULL NULL NULL 1024 Using where
explain select * from t0 force index(i1, i2, i3, i4, i5, i6 ) where
((key3 < 4or key5 < 4) and (key1 < 4or key2 < 4)) or
((key3 >=5or key5 < 2) and (key5 < 5or key6 < 6));
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2,i3,i5,i6 i3,i5 4,4 NULL 1024 Using sort_union(i3,i5); Using where
explain select * from t0 force index(i1, i2, i3, i4, i5, i6 ) where
((key3 < 5or key5 < 4) and (key1 < 4or key2 < 4)) or
((key3 >=5or key5 < 2) and (key5 < 5or key6 < 6));
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 ALL i1,i2,i3,i5,i6 NULL NULL NULL 1024 Using where
explain select * from t0 force index(i1, i2, i3, i4, i5, i6 ) where
((key3 < 10or key5 < 4) and (key1 < 4or key2 < 4)) or
((key3 >=5or key5 < 2) and (key5 < 5or key6 < 6));
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 ALL i1,i2,i3,i5,i6 NULL NULL NULL 1024 Using where
select * from t0 where key1 < 5or key8 < 4 order by key1;
key1 key2 key3 key4 key5 key6 key7 key8 11111111023 22222221022 33333331021 44444441020 10211021102110211021102110213 10221022102210221022102210222 10231023102310231023102310231 10241024102410241024102410240
explain
select * from t0 where key1 < 5or key8 < 4 order by key1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i8 i1,i8 4,4 NULL 7 Using sort_union(i1,i8); Using where; Using filesort
create table t2 like t0;
insert into t2 select * from t0;
alter table t2 add index i1_3(key1, key3);
alter table t2 add index i2_3(key2, key3);
alter table t2 drop index i1;
alter table t2 drop index i2;
alter table t2 add index i321(key3, key2, key1);
explain select key3 from t2 where key1 = 100or key2 = 100;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index_merge i1_3,i2_3 i1_3,i2_3 4,4 NULL 2 Using sort_union(i1_3,i2_3); Using where
explain select key3 from t2 where key1 < 600or key2 < 600;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index i1_3,i2_3 i321 12 NULL 1024 Using where; Using index
explain select key7 from t2 where key1 <100or key2 < 100;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ALL i1_3,i2_3 NULL NULL NULL 1024 Using where
create table t4 (
key1a int not null,
key1b int not null,
key2 int not null,
key2_1 int not null,
key2_2 int not null,
key3 int not null,
index i1a (key1a, key1b),
index i1b (key1b, key1a),
index i2_1(key2, key2_1),
index i2_2(key2, key2_1)
);
Warnings:
Note 1831 Duplicate index `i2_2`. This is deprecated and will be disallowed in a future release
insert into t4 select seq,seq,seq div 10, seq % 10, seq % 10, seq from seq_1_to_1024;
select * from t4 where key1a = 3or key1b = 4;
key1a key1b key2 key2_1 key2_2 key3 330333 440444
explain select * from t4 where key1a = 3or key1b = 4;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t4 index_merge i1a,i1b i1a,i1b 4,4 NULL 2 Using sort_union(i1a,i1b); Using where
explain select * from t4 where key2 = 1and (key2_1 = 1or key3 = 5);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t4 ref i2_1,i2_2 i2_1 4 const 9 Using where
explain select * from t4 where key2 = 1and (key2_1 = 1or key2_2 = 5);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t4 ref i2_1,i2_2 i2_1 4 const 9 Using where
explain select * from t4 where key2_1 = 1or key2_2 = 5;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t4 ALL NULL NULL NULL NULL 1024 Using where
create table t1 like t0;
insert into t1 select * from t0;
explain select * from t0 left join t1 on (t0.key1=t1.key1)
where t0.key1=3or t0.key2=4;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where 1 SIMPLE t1 ref i1 i1 4 test.t0.key1 1
select * from t0 left join t1 on (t0.key1=t1.key1)
where t0.key1=3or t0.key2=4;
key1 key2 key3 key4 key5 key6 key7 key8 key1 key2 key3 key4 key5 key6 key7 key8 3333333102133333331021 4444444102044444441020
explain
select * from t0,t1 where (t0.key1=t1.key1) and ( t0.key1=3or t0.key2=4);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where 1 SIMPLE t1 ref i1 i1 4 test.t0.key1 1
explain
select * from t0,t1 where (t0.key1=t1.key1) and
(t0.key1=3or t0.key2=4) and t1.key1<200;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where 1 SIMPLE t1 ref i1 i1 4 test.t0.key1 1
explain
select * from t0,t1 where (t0.key1=t1.key1) and
(t0.key1=3or t0.key2<4) and t1.key1=2;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 ref i1,i2 i1 4 const 1 Using where 1 SIMPLE t1 ref i1 i1 4 const 1
explain select * from t0,t1 where t0.key1 = 5and
(t1.key1 = t0.key1 or t1.key8 = t0.key1);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 ref i1 i1 4 const 1 1 SIMPLE t1 index_merge i1,i8 i1,i8 4,4 NULL 2 Using union(i1,i8); Using where; Using join buffer (flat, BNL join)
explain select * from t0,t1 where t0.key1 < 3and
(t1.key1 = t0.key1 or t1.key8 = t0.key1);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 range i1 i1 4 NULL 2 Using index condition 1 SIMPLE t1 ALL i1,i8 NULL NULL NULL 1024 Range checked for each record (index map: 0x81)
explain select * from t1 where key1=3or key2=4
union select * from t1 where key1<4or key3=5;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 index_merge i1,i2 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where 2 UNION t1 index_merge i1,i3 i1,i3 4,4 NULL 4 Using sort_union(i1,i3); Using where
NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL set @tmp_optimizer_switch=@@optimizer_switch; set optimizer_switch='derived_merge=off,derived_with_keys=off';
explain select * from (select * from t1 where key1 = 3or key2 =3) as Z where key8 >5;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2 Using where 2 DERIVED t1 index_merge i1,i2,i8 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where set optimizer_switch=@tmp_optimizer_switch;
create table t3 like t0;
insert into t3 select * from t0;
alter table t3 add key9 int not null, add index i9(key9);
alter table t3 add keyA int not null, add index iA(keyA);
alter table t3 add keyB int not null, add index iB(keyB);
alter table t3 add keyC int not null, add index iC(keyC);
update t3 set key9=key1,keyA=key1,keyB=key1,keyC=key1;
explain select * from t3 where
key1=1or key2=2or key3=3or key4=4or
key5=5or key6=6or key7=7or key8=8or
key9=9or keyA=10or keyB=11or keyC=12;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t3 index_merge i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC 4,4,4,4,4,4,4,4,4,4,4,4 NULL 12 Using union(i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC); Using where
select * from t3 where
key1=1or key2=2or key3=3or key4=4or
key5=5or key6=6or key7=7or key8=8or
key9=9or keyA=10or keyB=11or keyC=12;
key1 key2 key3 key4 key5 key6 key7 key8 key9 keyA keyB keyC 111111110231111 222222210222222 333333310213333 444444410204444 555555510195555 666666610186666 777777710177777 999999910159999 10101010101010101410101010 11111111111111101311111111 12121212121212101212121212 101610161016101610161016101681016101610161016
explain select * from t0 where key1 < 3or key2 < 4;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 5 Using sort_union(i1,i2); Using where
select * from t0 where key1 < 3or key2 < 4;
key1 key2 key3 key4 key5 key6 key7 key8 11111111023 22222221022 33333331021
update t0 set key8=123 where key1 < 3or key2 < 4;
select * from t0 where key1 < 3or key2 < 4;
key1 key2 key3 key4 key5 key6 key7 key8 1111111123 2222222123 3333333123
delete from t0 where key1 < 3or key2 < 4;
select * from t0 where key1 < 3or key2 < 4;
key1 key2 key3 key4 key5 key6 key7 key8
select count(*) from t0;
count(*) 1021
drop table t4;
create table t4 (a int);
insert into t4 values (1),(4),(3); set @save_join_buffer_size=@@join_buffer_size; set join_buffer_size= 4096;
explain select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5) as exp
from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
where (A.key1 < 500000or A.key2 < 3) and (B.key1 < 500000or B.key2 < 3);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE A index_merge i1,i2 i1,i2 4,4 NULL 1010 Using sort_union(i1,i2); Using where 1 SIMPLE B index_merge i1,i2 i1,i2 4,4 NULL 1010 Using sort_union(i1,i2); Using where; Using join buffer (flat, BNL join)
select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5) as exp
from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
where (A.key1 < 500000or A.key2 < 3) and (B.key1 < 500000or B.key2 < 3);
exp 10240
update t0 set key1=1;
explain select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5) as exp
from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
where (A.key1 = 1or A.key2 = 1) and (B.key1 = 1or B.key2 = 1);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE A index_merge i1,i2 i1,i2 4,4 NULL 1021 Using union(i1,i2); Using where 1 SIMPLE B index_merge i1,i2 i1,i2 4,4 NULL 1021 Using union(i1,i2); Using where; Using join buffer (flat, BNL join)
select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5) as exp
from t0 as A force index(i1,i2), t0 as B force index (i1,i2)
where (A.key1 = 1or A.key2 = 1) and (B.key1 = 1or B.key2 = 1);
exp 8194
alter table t0 add filler1 char(200), add filler2 char(200), add filler3 char(200);
update t0 set key2=1, key3=1, key4=1, key5=1,key6=1,key7=1 where key7 < 500;
explain select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5) as exp
from t0 as A straight_join t0 as B
where (A.key1 = 1and A.key2 = 1and A.key3 = 1and A.key4=1and A.key5=1and A.key6=1and A.key7 = 1or A.key8=1) and (B.key1 = 1and B.key2 = 1and B.key3 = 1and B.key4=1and B.key5=1and B.key6=1and B.key7 = 1orB.key8=1);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE A ALL i1,i2,i3,i4,i5,i6,i7?,i8 NULL NULL NULL # Using where 1 SIMPLE B ALL i1,i2,i3,i4,i5,i6,i7?,i8 NULL NULL NULL # Using where; Using join buffer (flat, BNL join)
select max(A.key1 + B.key1 + A.key2 + B.key2 + A.key3 + B.key3 + A.key4 + B.key4 + A.key5 + B.key5) as exp
from t0 as A straight_join t0 as B
where (A.key1 = 1and A.key2 = 1and A.key3 = 1and A.key4=1and A.key5=1and A.key6=1and A.key7 = 1or A.key8=1) and (B.key1 = 1and B.key2 = 1and B.key3 = 1and B.key4=1and B.key5=1and B.key6=1and B.key7 = 1orB.key8=1);
exp 8186 set join_buffer_size= @save_join_buffer_size;
drop table t0, t1, t2, t3, t4;
CREATE TABLE t1 (
cola char(3) not null, colb char(3) not null, filler char(200),
key(cola), key(colb)
);
INSERT INTO t1 VALUES ('foo','bar', 'ZZ'),('fuz','baz', 'ZZ');
OPTIMIZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 optimize status OK
select count(*) from t1;
count(*) 8704
explain select * from t1 WHERE cola = 'foo'AND colb = 'bar';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge cola,colb cola,colb 3,3 NULL 32 Using intersect(cola,colb); Using where
explain select * from t1 force index(cola,colb) WHERE cola = 'foo'AND colb = 'bar';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge cola,colb cola,colb 3,3 NULL 32 Using intersect(cola,colb); Using where
drop table t1;
create table t1 (
a int, b int,
filler1 char(200), filler2 char(200),
key(a),key(b)
);
insert into t1 select @v:= seq % 10, @v, 't1', 'filler2' from seq_1_to_1000;
create table t2 like t1;
create table t3 (
a int, b int,
filler1 char(200), filler2 char(200),
key(a),key(b)
) engine=merge union=(t1,t2);
explain select * from t1 where a=1and b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge a,b a,b 5,5 NULL # Using intersect(a,b); Using where
explain select * from t3 where a=1and b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t3 index_merge a,b a,b 5,5 NULL # Using intersect(a,b); Using where
drop table t1, t2, t3;
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES(1);
CREATE TABLE t2(a INT, b INT, dummy CHAR(16) DEFAULT '', KEY(a), KEY(b));
INSERT INTO t2(a,b) VALUES
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(1,2);
LOCK TABLES t1 WRITE, t2 WRITE;
INSERT INTO t2(a,b) VALUES(1,2);
SELECT t2.a FROM t1,t2 WHERE t2.b=2AND t2.a=1;
a 1 1
UNLOCK TABLES;
DROP TABLE t1, t2;
CREATE TABLE `t1` (
`a` int(11) DEFAULT NULL,
`filler` char(200) DEFAULT NULL,
`b` int(11) DEFAULT NULL,
KEY `a` (`a`),
KEY `b` (`b`)
) ENGINE=MEMORY DEFAULT CHARSET=latin1;
insert into t1 values
(0, 'filler', 0), (1, 'filler', 1), (2, 'filler', 2), (3, 'filler', 3),
(4, 'filler', 4), (5, 'filler', 5), (6, 'filler', 6), (7, 'filler', 7),
(8, 'filler', 8), (9, 'filler', 9), (0, 'filler', 0), (1, 'filler', 1),
(2, 'filler', 2), (3, 'filler', 3), (4, 'filler', 4), (5, 'filler', 5),
(6, 'filler', 6), (7, 'filler', 7), (8, 'filler', 8), (9, 'filler', 9),
(10, 'filler', 10), (11, 'filler', 11), (12, 'filler', 12), (13, 'filler', 13),
(14, 'filler', 14), (15, 'filler', 15), (16, 'filler', 16), (17, 'filler', 17),
(18, 'filler', 18), (19, 'filler', 19), (4, '5 ', 0), (5, '4 ', 0),
(4, '4 ', 0), (4, 'qq ', 5), (5, 'qq ', 4), (4, 'zz ', 4);
create table t2(
`a` int(11) DEFAULT NULL,
`filler` char(200) DEFAULT NULL,
`b` int(11) DEFAULT NULL,
KEY USING BTREE (`a`),
KEY USING BTREE (`b`)
) ENGINE=MEMORY DEFAULT CHARSET=latin1;
insert into t2 select * from t1;
must use sort-union rather than union:
explain select * from t1 where a=4or b=4;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge a,b a,b 5,5 NULL # Using sort_union(a,b); Using where
select * from t1 where a=4or b=4;
a filler b 440 450 4 filler 4 4 filler 4 4 qq 5 4 zz 4 5 qq 4
select * from t1 ignore index(a,b) where a=4or b=4;
a filler b 440 450 4 filler 4 4 filler 4 4 qq 5 4 zz 4 5 qq 4
must use union, not sort-union:
explain select * from t2 where a=2or b=2;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index_merge a,b a,b 5,5 NULL # Using union(a,b); Using where
select * from t2 where a=2or b=2;
a filler b 2 filler 2 2 filler 2
drop table t1, t2;
CREATE TABLE t1 (a varchar(8), b set('a','b','c','d','e','f','g','h'),
KEY b(b), KEY a(a));
INSERT INTO t1 VALUES ('y',''), ('z','');
SELECT b,a from t1 WHERE (b!='c'AND b!='f' && b!='h') OR
(a='pure-S') OR (a='DE80337a') OR (a='DE80799');
b a
y
z
DROP TABLE t1;
#
# BUG#40974: Incorrect query results when using clause evaluated using range check
#
create table t1 (a int);
insert into t1 values (1),(2);
create table t2(a int, b int);
insert into t2 values (1,1), (2, 1000),(5000,5000);
create table t3 (a int, b int, filler char(100), key(a), key(b));
insert into t3 select 1000, 1000,'filler' from seq_1_to_1000;
insert into t3 values (1,1,'data');
insert into t3 values (1,1,'data');
The plan should be ALL/ALL/ALL(Range checked for each record (index map: 0x3)
explain select * from t1
where exists (select 1 from t2, t3
where t2.a=t1.a and (t3.a=t2.b or t3.b=t2.b or t3.b=t2.b+1));
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 2 1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 2 MATERIALIZED t2 ALL NULL NULL NULL NULL 3 2 MATERIALIZED t3 ALL a,b NULL NULL NULL 1002 Range checked for each record (index map: 0x3)
select * from t1
where exists (select 1 from t2, t3
where t2.a=t1.a and (t3.a=t2.b or t3.b=t2.b or t3.b=t2.b+1));
a 1 2
drop table t1, t2, t3;
#
# BUG#44810: index merge and order by with low sort_buffer_size
# crashes server!
#
CREATE TABLE t1(a VARCHAR(128),b VARCHAR(128),KEY(A),KEY(B));
INSERT INTO t1 SELECT REPEAT('a',128),REPEAT('b',128) FROM seq_1_to_64; SET SESSION sort_buffer_size=1024*8;
EXPLAIN
SELECT * FROM t1 FORCE INDEX(a,b) WHERE a LIKE 'a%'OR b LIKE 'b%'
ORDER BY a,b;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge a,b a,b 131,131 NULL 64 Using sort_union(a,b); Using where; Using filesort
SELECT * FROM t1 FORCE INDEX(a,b) WHERE a LIKE 'a%'OR b LIKE 'b%'
ORDER BY a,b; SET SESSION sort_buffer_size=DEFAULT;
DROP TABLE t1;
End of 5.0 tests
#---------------- ROR-index_merge tests -----------------------
create table t1
( /* Field names reflect value(rowid) distribution, st=STairs, swt= SaWTooth */
st_a int not null default 0,
swt1a int not null default 0,
swt2a int not null default 0,
st_b int not null default 0,
swt1b int not null default 0,
swt2b int not null default 0, /* fields/keys for row retrieval tests */
key1 int,
key2 int,
key3 int,
key4 int, /* make rows much bigger then keys */
filler1 char (200),
filler2 char (200),
filler3 char (200),
filler4 char (200),
filler5 char (200),
filler6 char (200), /* order of keys is important */
key sta_swt12a(st_a,swt1a,swt2a),
key sta_swt1a(st_a,swt1a),
key sta_swt2a(st_a,swt2a),
key sta_swt21a(st_a,swt2a,swt1a),
key st_a(st_a),
key stb_swt1a_2b(st_b,swt1b,swt2a),
key stb_swt1b(st_b,swt1b),
key st_b(st_b),
key(key1),
key(key2),
key(key3),
key(key4)
) ;
create table t0 as select * from t1;
# Printing of many insert into t0 values (....) disabled.
alter table t1 disable keys;
# Printing of many insert into t1 select .... from t0 disabled.
# Printing of many insert into t1 (...) values (....) disabled.
alter table t1 enable keys;
select count(*) from t1;
count(*) 64801
explain select key1,key2 from t1 where key1=100and key2=100;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 77 Using intersect(key1,key2); Using where; Using index
select key1,key2 from t1 where key1=100and key2=100;
key1 key2 100100
explain select key1,key2,key3,key4,filler1 from t1 where key1=100and key2=100or key3=100and key4=100;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 154 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
select key1,key2,key3,key4,filler1 from t1 where key1=100and key2=100or key3=100and key4=100;
key1 key2 key3 key4 filler1 100100100100 key1-key2-key3-key4
insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, -1, -1, 'key1-key2');
insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, 100, 100, 'key4-key3');
explain select key1,key2,filler1 from t1 where key1=100and key2=100;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 77 Using intersect(key1,key2); Using where
select key1,key2,filler1 from t1 where key1=100and key2=100;
key1 key2 filler1 100100 key1-key2-key3-key4 100100 key1-key2
explain select key1,key2 from t1 where key1=100and key2=100;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 77 Using intersect(key1,key2); Using where; Using index
select key1,key2 from t1 where key1=100and key2=100;
key1 key2 100100 100100
explain select key1,key2,key3,key4 from t1 where key1=100and key2=100or key3=100and key4=100;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 154 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
select key1,key2,key3,key4 from t1 where key1=100and key2=100or key3=100and key4=100;
key1 key2 key3 key4 100100100100 100100 -1 -1
-1 -1100100
explain select key1,key2,key3,key4,filler1 from t1 where key1=100and key2=100or key3=100and key4=100;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 154 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
select key1,key2,key3,key4,filler1 from t1 where key1=100and key2=100or key3=100and key4=100;
key1 key2 key3 key4 filler1 100100100100 key1-key2-key3-key4 100100 -1 -1 key1-key2
-1 -1100100 key4-key3
explain select key1,key2,key3 from t1 where key1=100and key2=100and key3=100;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2,key3 key1,key2 5,5 NULL 77 Using intersect(key1,key2); Using where
select key1,key2,key3 from t1 where key1=100and key2=100and key3=100;
key1 key2 key3 100100100
insert into t1 (key1,key2,key3,key4,filler1) values (101,101,101,101, 'key1234-101');
explain select key1,key2,key3,key4,filler1 from t1 where key1=100and key2=100or key3=101;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2,key3 key1,key2,key3 5,5,5 NULL 83 Using union(intersect(key1,key2),key3); Using where
select key1,key2,key3,key4,filler1 from t1 where key1=100and key2=100or key3=101;
key1 key2 key3 key4 filler1 100100100100 key1-key2-key3-key4 100100 -1 -1 key1-key2 101101101101 key1234-101
select key1,key2, filler1 from t1 where key1=100and key2=100;
key1 key2 filler1 100100 key1-key2-key3-key4 100100 key1-key2
update t1 set filler1='to be deleted' where key1=100and key2=100;
update t1 set key1=200,key2=200 where key1=100and key2=100;
delete from t1 where key1=200and key2=200;
select key1,key2,filler1 from t1 where key2=100and key2=200;
key1 key2 filler1
explain select key1,key2,key3,key4,filler1 from t1 where key1=100and key2=100or key3=100and key4=100;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 154 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
select key1,key2,key3,key4,filler1 from t1 where key1=100and key2=100or key3=100and key4=100;
key1 key2 key3 key4 filler1
-1 -1100100 key4-key3
delete from t1 where key3=100and key4=100;
explain select key1,key2,key3,key4,filler1 from t1 where key1=100and key2=100or key3=100and key4=100;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 154 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
select key1,key2,key3,key4,filler1 from t1 where key1=100and key2=100or key3=100and key4=100;
key1 key2 key3 key4 filler1
explain select key1,key2 from t1 where key1=100and key2=100;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 77 Using intersect(key1,key2); Using where; Using index
select key1,key2 from t1 where key1=100and key2=100;
key1 key2
insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-1');
insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-2');
insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-3');
explain select key1,key2,key3,key4,filler1 from t1 where key3=200or (key1=100and key2=100) or key4=200;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2,key3,key4 key3,key1,key2,key4 5,5,5,5 NULL 137 Using union(key3,intersect(key1,key2),key4); Using where
select key1,key2,key3,key4,filler1 from t1 where key3=200or (key1=100and key2=100) or key4=200;
key1 key2 key3 key4 filler1 100100200200 key1-key2-key3-key4-3 100100200200 key1-key2-key3-key4-2 100100200200 key1-key2-key3-key4-1
insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, -1, 200,'key4');
explain select key1,key2,key3,key4,filler1 from t1 where key3=200or (key1=100and key2=100) or key4=200;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2,key3,key4 key3,key1,key2,key4 5,5,5,5 NULL 148 Using union(key3,intersect(key1,key2),key4); Using where
select key1,key2,key3,key4,filler1 from t1 where key3=200or (key1=100and key2=100) or key4=200;
key1 key2 key3 key4 filler1 100100200200 key1-key2-key3-key4-3 100100200200 key1-key2-key3-key4-2 100100200200 key1-key2-key3-key4-1
-1 -1 -1200 key4
insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, 200, -1,'key3');
explain select key1,key2,key3,key4,filler1 from t1 where key3=200or (key1=100and key2=100) or key4=200;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2,key3,key4 key3,key1,key2,key4 5,5,5,5 NULL 159 Using union(key3,intersect(key1,key2),key4); Using where
select key1,key2,key3,key4,filler1 from t1 where key3=200or (key1=100and key2=100) or key4=200;
key1 key2 key3 key4 filler1 100100200200 key1-key2-key3-key4-3 100100200200 key1-key2-key3-key4-2 100100200200 key1-key2-key3-key4-1
-1 -1 -1200 key4
-1 -1200 -1 key3
explain select * from t1 where st_a=1and st_b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b st_a,st_b 4,4 NULL 3515 Using intersect(st_a,st_b); Using where
explain select st_a,st_b from t1 where st_a=1and st_b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b st_a,st_b 4,4 NULL 3515 Using intersect(st_a,st_b); Using where; Using index
explain select st_a from t1 ignore index (st_a) where st_a=1and st_b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,stb_swt1a_2b,stb_swt1b,st_b NULL NULL NULL 64806 Using where
explain select * from t1 where st_a=1and swt1a=1and swt2a=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a sta_swt21a 12 const,const,const 971
explain select * from t1 where st_b=1and swt1b=1and swt2b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref stb_swt1a_2b,stb_swt1b,st_b stb_swt1a_2b 8 const,const 3879 Using where
explain select * from t1 where st_a=1and swt1a=1and swt2a=1and st_b=1and swt1b=1and swt2b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt12a,stb_swt1a_2b 12,12 NULL 58 Using intersect(sta_swt12a,stb_swt1a_2b); Using where
explain select * from t1 ignore index (sta_swt21a, stb_swt1a_2b)
where st_a=1and swt1a=1and swt2a=1and st_b=1and swt1b=1and swt2b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,st_a,stb_swt1b,st_b sta_swt12a,stb_swt1b 12,8 NULL 58 Using intersect(sta_swt12a,stb_swt1b); Using where
explain select * from t1 ignore index (sta_swt21a, sta_swt12a, stb_swt1a_2b)
where st_a=1and swt1a=1and swt2a=1and st_b=1and swt1b=1and swt2b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge sta_swt1a,sta_swt2a,st_a,stb_swt1b,st_b sta_swt1a,sta_swt2a,stb_swt1b 8,8,8 NULL 57 Using intersect(sta_swt1a,sta_swt2a,stb_swt1b); Using where
explain select * from t1 ignore index (sta_swt21a, sta_swt12a, stb_swt1a_2b, stb_swt1b)
where st_a=1and swt1a=1and swt2a=1and st_b=1and swt1b=1and swt2b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge sta_swt1a,sta_swt2a,st_a,st_b sta_swt1a,sta_swt2a 8,8 NULL 960 Using intersect(sta_swt1a,sta_swt2a); Using where
explain select * from t1
where st_a=1and swt1a=1and swt2a=1and st_b=1and swt1b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt12a,stb_swt1a_2b 12,12 NULL 58 Using intersect(sta_swt12a,stb_swt1a_2b); Using where
explain select * from t1
where st_a=1and swt1a=1and st_b=1and swt1b=1and swt1b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 232 Using intersect(sta_swt1a,stb_swt1b); Using where
explain select st_a from t1
where st_a=1and swt1a=1and st_b=1and swt1b=1and swt1b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 232 Using intersect(sta_swt1a,stb_swt1b); Using where; Using index
explain select st_a from t1
where st_a=1and swt1a=1and st_b=1and swt1b=1and swt1b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 232 Using intersect(sta_swt1a,stb_swt1b); Using where; Using index
drop table t0,t1;
create table t2 (
a char(10),
b char(10),
filler1 char(255),
filler2 char(255),
key(a(5)),
key(b(5))
);
select count(a) from t2 where a='BBBBBBBB';
count(a) 4
select count(a) from t2 where b='BBBBBBBB';
count(a) 4
expla_or_bin select count(a_or_b) from t2 where a_or_b='AAAAAAAA' a_or_bnd a_or_b='AAAAAAAA';
id select_type ta_or_ba_or_ble type possia_or_ble_keys key key_len ref rows Extra_or_b 1 SIMPLE t2 ref a_or_b,a_or_b a_or_b 6 const 4 Using where
select count(a) from t2 where a='AAAAAAAA'and b='AAAAAAAA';
count(a) 4
select count(a) from t2 ignore index(a,b) where a='AAAAAAAA'and b='AAAAAAAA';
count(a) 4
insert into t2 values ('ab', 'ab', 'uh', 'oh');
explain select a from t2 where a='ab';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ref a a 6 const 1 Using where
drop table t2;
CREATE TABLE t1(c1 INT, c2 INT DEFAULT 0, c3 CHAR(255) DEFAULT '',
KEY(c1), KEY(c2), KEY(c3));
INSERT INTO t1(c1) VALUES(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),
(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0);
INSERT INTO t1 VALUES(0,0,0);
CREATE TABLE t2(c1 int);
INSERT INTO t2 VALUES(1);
DELETE t1 FROM t1,t2 WHERE t1.c1=0AND t1.c2=0;
SELECT * FROM t1;
c1 c2 c3
DROP TABLE t1,t2;
#---------------- Index merge test 2 -------------------------------------------
create table t1
(
key1 int not null,
key2 int not null,
INDEX i1(key1),
INDEX i2(key2)
);
INSERT INTO t1 SELECT seq,200-seq FROM seq_0_to_200;
explain select * from t1 where key1 < 5or key2 > 197;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using sort_union(i1,i2); Using where
select * from t1 where key1 < 5or key2 > 197;
key1 key2 0200 1199 2198 3197 4196
explain select * from t1 where key1 < 3or key2 > 195;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using sort_union(i1,i2); Using where
select * from t1 where key1 < 3or key2 > 195;
key1 key2 0200 1199 2198 3197 4196
alter table t1 add str1 char (255) not null,
add zeroval int not null default 0,
add str2 char (255) not null,
add str3 char (255) not null;
update t1 set str1='aaa', str2='bbb', str3=concat(key2, '-', key1 div 2, '_' ,if(key1 mod 2 = 0, 'a', 'A'));
alter table t1 add primary key (str1, zeroval, str2, str3);
explain select * from t1 where key1 < 5or key2 > 197;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using sort_union(i1,i2); Using where
select * from t1 where key1 < 5or key2 > 197;
key1 key2 str1 zeroval str2 str3 0200 aaa 0 bbb 200-0_a 1199 aaa 0 bbb 199-0_A 2198 aaa 0 bbb 198-1_a 3197 aaa 0 bbb 197-1_A 4196 aaa 0 bbb 196-2_a
explain select * from t1 where key1 < 3or key2 > 195;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using sort_union(i1,i2); Using where
select * from t1 where key1 < 3or key2 > 195;
key1 key2 str1 zeroval str2 str3 0200 aaa 0 bbb 200-0_a 1199 aaa 0 bbb 199-0_A 2198 aaa 0 bbb 198-1_a 3197 aaa 0 bbb 197-1_A 4196 aaa 0 bbb 196-2_a
drop table t1;
create table t1 (
pk integer not null auto_increment primary key,
key1 integer,
key2 integer not null,
filler char (200),
index (key1),
index (key2)
);
show warnings;
Level Code Message
INSERT INTO t1 (key1, key2, filler)
SELECT seq/4, seq/8, 'filler-data' FROM seq_30_to_0;
explain select pk from t1 where key1 = 1and key2 = 1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2 key1,key2 5,4 NULL 1 Using intersect(key1,key2); Using where
select pk from t1 where key2 = 1and key1 = 1;
pk 26 27
select pk from t1 ignore index(key1,key2) where key2 = 1and key1 = 1;
pk 26 27
drop table t1;
create table t1 (
pk int primary key auto_increment,
key1a int,
key2a int,
key1b int,
key2b int,
dummy1 int,
dummy2 int,
dummy3 int,
dummy4 int,
key3a int,
key3b int,
filler1 char (200),
index i1(key1a, key1b),
index i2(key2a, key2b),
index i3(key3a, key3b)
);
create table t2 (a int);
insert into t2 values (0),(1),(2),(3),(4),(NULL);
insert into t1 (key1a, key1b, key2a, key2b, key3a, key3b)
select A.a, B.a, C.a, D.a, C.a, D.a from t2 A,t2 B,t2 C, t2 D;
insert into t1 (key1a, key1b, key2a, key2b, key3a, key3b)
select key1a, key1b, key2a, key2b, key3a, key3b from t1;
insert into t1 (key1a, key1b, key2a, key2b, key3a, key3b)
select key1a, key1b, key2a, key2b, key3a, key3b from t1;
analyze table t1;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
select count(*) from t1;
count(*) 5184
explain select count(*) from t1 where
key1a = 2and key1b is null and key2a = 2and key2b is null;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge i1,i2 i1,i2 10,10 NULL REF Using intersect(i1,i2); Using where; Using index
select count(*) from t1 where
key1a = 2and key1b is null and key2a = 2and key2b is null;
count(*) 4
explain select count(*) from t1 where
key1a = 2and key1b is null and key3a = 2and key3b is null;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge i1,i3 i1,i3 10,10 NULL REF Using intersect(i1,i3); Using where; Using index
select count(*) from t1 where
key1a = 2and key1b is null and key3a = 2and key3b is null;
count(*) 4
drop table t1,t2;
create table t1 (
id1 int,
id2 date ,
index idx2 (id1,id2),
index idx1 (id2)
);
insert into t1 values(1,'20040101'), (2,'20040102');
select * from t1 where id1 = 1and id2= '20040101';
id1 id2 12004-01-01
drop table t1;
drop view if exists v1;
CREATE TABLE t1 (
`oid` int(11) unsigned NOT NULL auto_increment,
`fk_bbk_niederlassung` int(11) unsigned NOT NULL,
`fk_wochentag` int(11) unsigned NOT NULL,
`uhrzeit_von` time NOT NULL COMMENT 'HH:MM',
`uhrzeit_bis` time NOT NULL COMMENT 'HH:MM',
`geloescht` tinyint(4) NOT NULL,
`version` int(5) NOT NULL,
PRIMARY KEY (`oid`),
KEY `fk_bbk_niederlassung` (`fk_bbk_niederlassung`),
KEY `fk_wochentag` (`fk_wochentag`),
KEY `ix_version` (`version`)
) DEFAULT CHARSET=latin1;
insert into t1 values
(1, 38, 1, '08:00:00', '13:00:00', 0, 1),
(2, 38, 2, '08:00:00', '13:00:00', 0, 1),
(3, 38, 3, '08:00:00', '13:00:00', 0, 1),
(4, 38, 4, '08:00:00', '13:00:00', 0, 1),
(5, 38, 5, '08:00:00', '13:00:00', 0, 1),
(6, 38, 5, '08:00:00', '13:00:00', 1, 2),
(7, 38, 3, '08:00:00', '13:00:00', 1, 2),
(8, 38, 1, '08:00:00', '13:00:00', 1, 2),
(9, 38, 2, '08:00:00', '13:00:00', 1, 2),
(10, 38, 4, '08:00:00', '13:00:00', 1, 2),
(11, 38, 1, '08:00:00', '13:00:00', 0, 3),
(12, 38, 2, '08:00:00', '13:00:00', 0, 3),
(13, 38, 3, '08:00:00', '13:00:00', 0, 3),
(14, 38, 4, '08:00:00', '13:00:00', 0, 3),
(15, 38, 5, '08:00:00', '13:00:00', 0, 3),
(16, 38, 4, '08:00:00', '13:00:00', 0, 4),
(17, 38, 5, '08:00:00', '13:00:00', 0, 4),
(18, 38, 1, '08:00:00', '13:00:00', 0, 4),
(19, 38, 2, '08:00:00', '13:00:00', 0, 4),
(20, 38, 3, '08:00:00', '13:00:00', 0, 4),
(21, 7, 1, '08:00:00', '13:00:00', 0, 1),
(22, 7, 2, '08:00:00', '13:00:00', 0, 1),
(23, 7, 3, '08:00:00', '13:00:00', 0, 1),
(24, 7, 4, '08:00:00', '13:00:00', 0, 1),
(25, 7, 5, '08:00:00', '13:00:00', 0, 1);
create view v1 as
select
zeit1.oid AS oid,
zeit1.fk_bbk_niederlassung AS fk_bbk_niederlassung,
zeit1.fk_wochentag AS fk_wochentag,
zeit1.uhrzeit_von AS uhrzeit_von,
zeit1.uhrzeit_bis AS uhrzeit_bis,
zeit1.geloescht AS geloescht,
zeit1.version AS version
from
t1 zeit1
where
(zeit1.version =
(select max(zeit2.version) AS `max(version)`
from t1 zeit2
where
((zeit1.fk_bbk_niederlassung = zeit2.fk_bbk_niederlassung) and
(zeit1.fk_wochentag = zeit2.fk_wochentag) and
(zeit1.uhrzeit_von = zeit2.uhrzeit_von) and
(zeit1.uhrzeit_bis = zeit2.uhrzeit_bis)
)
)
) and (zeit1.geloescht = 0);
select * from v1 where oid = 21;
oid fk_bbk_niederlassung fk_wochentag uhrzeit_von uhrzeit_bis geloescht version 217108:00:0013:00:0001
drop view v1;
drop table t1;
CREATE TABLE t1(
t_cpac varchar(2) NOT NULL,
t_vers varchar(4) NOT NULL,
t_rele varchar(2) NOT NULL,
t_cust varchar(4) NOT NULL,
filler1 char(250) default NULL,
filler2 char(250) default NULL,
PRIMARY KEY (t_cpac,t_vers,t_rele,t_cust),
UNIQUE KEY IX_4 (t_cust,t_cpac,t_vers,t_rele),
KEY IX_5 (t_vers,t_rele,t_cust)
);
insert into t1 values
('tm','2.5 ','a ',' ','',''), ('tm','2.5U','a ','stnd','',''),
('da','3.3 ','b ',' ','',''), ('da','3.3U','b ','stnd','',''),
('tl','7.6 ','a ',' ','',''), ('tt','7.6 ','a ',' ','',''),
('bc','B61 ','a ',' ','',''), ('bp','B61 ','a ',' ','',''),
('ca','B61 ','a ',' ','',''), ('ci','B61 ','a ',' ','',''),
('cp','B61 ','a ',' ','',''), ('dm','B61 ','a ',' ','',''),
('ec','B61 ','a ',' ','',''), ('ed','B61 ','a ',' ','',''),
('fm','B61 ','a ',' ','',''), ('nt','B61 ','a ',' ','',''),
('qm','B61 ','a ',' ','',''), ('tc','B61 ','a ',' ','',''),
('td','B61 ','a ',' ','',''), ('tf','B61 ','a ',' ','',''),
('tg','B61 ','a ',' ','',''), ('ti','B61 ','a ',' ','',''),
('tp','B61 ','a ',' ','',''), ('ts','B61 ','a ',' ','',''),
('wh','B61 ','a ',' ','',''), ('bc','B61U','a ','stnd','',''),
('bp','B61U','a ','stnd','',''), ('ca','B61U','a ','stnd','',''),
('ci','B61U','a ','stnd','',''), ('cp','B61U','a ','stnd','',''),
('dm','B61U','a ','stnd','',''), ('ec','B61U','a ','stnd','',''),
('fm','B61U','a ','stnd','',''), ('nt','B61U','a ','stnd','',''),
('qm','B61U','a ','stnd','',''), ('tc','B61U','a ','stnd','',''),
('td','B61U','a ','stnd','',''), ('tf','B61U','a ','stnd','',''),
('tg','B61U','a ','stnd','',''), ('ti','B61U','a ','stnd','',''),
('tp','B61U','a ','stnd','',''), ('ts','B61U','a ','stnd','',''),
('wh','B61U','a ','stnd','','');
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`t_cpac` varchar(2) NOT NULL,
`t_vers` varchar(4) NOT NULL,
`t_rele` varchar(2) NOT NULL,
`t_cust` varchar(4) NOT NULL,
`filler1` char(250) DEFAULT NULL,
`filler2` char(250) DEFAULT NULL,
PRIMARY KEY (`t_cpac`,`t_vers`,`t_rele`,`t_cust`),
UNIQUE KEY `IX_4` (`t_cust`,`t_cpac`,`t_vers`,`t_rele`),
KEY `IX_5` (`t_vers`,`t_rele`,`t_cust`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
select t_vers,t_rele,t_cust,filler1 from t1 where t_vers = '7.6';
t_vers t_rele t_cust filler1 7.6 a 7.6 a
select t_vers,t_rele,t_cust,filler1 from t1 where t_vers = '7.6' and t_rele='a'and t_cust = ' ';
t_vers t_rele t_cust filler1 7.6 a 7.6 a
drop table t1;
create table t1 (
pk int(11) not null auto_increment,
a int(11) not null default '0',
b int(11) not null default '0',
c int(11) not null default '0',
filler1 datetime, filler2 varchar(15),
filler3 longtext,
kp1 varchar(4), kp2 varchar(7),
kp3 varchar(2), kp4 varchar(4),
kp5 varchar(7),
filler4 char(1),
primary key (pk),
key idx1(a,b,c),
key idx2(c),
key idx3(kp1,kp2,kp3,kp4,kp5)
) default charset=latin1; set @fill=NULL;
SELECT COUNT(*) FROM t1 WHERE b = 0AND a = 0AND c = 13286427AND
kp1='279'AND kp2='ELM0678'AND kp3='6'AND kp4='10'AND kp5 = 'R ';
COUNT(*) 1
drop table t1;
create table t1
(
key1 int not null,
key2 int not null default 0,
key3 int not null default 0
);
insert into t1(key1) select seq from seq_1_to_1024;
alter table t1 add index i2(key2);
alter table t1 add index i3(key3);
update t1 set key2=key1,key3=key1;
insert into t1 select 10000+key1, 10000+key2,10000+key3 from t1;
analyze table t1;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
explain select * from t1 where (key3 > 30and key3<35) or (key2 >32and key2 < 40);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge i2,i3 i3,i2 4,4 NULL REF Using sort_union(i3,i2); Using where
select * from t1 where (key3 > 30and key3<35) or (key2 >32and key2 < 40);
key1 key2 key3 313131 323232 333333 343434 353535 363636 373737 383838 393939
drop table t1;
#
# Bug#56423: Different count with SELECT and CREATE SELECT queries
#
CREATE TABLE t1 (
a INT,
b INT,
c INT,
d INT,
PRIMARY KEY (a),
KEY (c),
KEY bd (b,d)
);
INSERT INTO t1 VALUES
(1, 0, 1, 0),
(2, 1, 1, 1),
(3, 1, 1, 1),
(4, 0, 1, 1);
EXPLAIN
SELECT a
FROM t1
WHERE c = 1AND b = 1AND d = 1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref c,bd bd 10 const,const 2 Using where
CREATE TABLE t2 ( a INT )
SELECT a
FROM t1
WHERE c = 1AND b = 1AND d = 1;
SELECT * FROM t2;
a 2 3
DROP TABLE t1, t2;
CREATE TABLE t1( a INT, b INT, KEY(a), KEY(b) );
INSERT INTO t1 VALUES (1, 2), (1, 2), (1, 2), (1, 2);
SELECT * FROM t1 FORCE INDEX(a, b) WHERE a = 1AND b = 2;
a b 12 12 12 12
DROP TABLE t1;
# Code coverage of fix.
CREATE TABLE t1 ( a INT NOT NULL AUTO_INCREMENT PRIMARY KEY, b INT);
INSERT INTO t1 (b) VALUES (1);
UPDATE t1 SET b = 2 WHERE a = 1;
SELECT * FROM t1;
a b 12
CREATE TABLE t2 ( a INT NOT NULL AUTO_INCREMENT PRIMARY KEY, b VARCHAR(1) );
INSERT INTO t2 (b) VALUES ('a');
UPDATE t2 SET b = 'b' WHERE a = 1;
SELECT * FROM t2;
a b 1 b
DROP TABLE t1, t2;
#---------------- 2-sweeps read Index merge test 2 -------------------------------
create table t1 (
pk int primary key,
key1 int,
key2 int,
filler char(200),
filler2 char(200),
index(key1),
index(key2)
);
insert into t1 select seq, seq, seq, 'filler-data', 'filler-data-2'
from seq_1000_to_1;
select * from t1 where (key1 >= 2and key1 <= 10) or (pk >= 4and pk <=8 );
pk key1 key2 filler filler2 101010 filler-data filler-data-2 999 filler-data filler-data-2 888 filler-data filler-data-2 777 filler-data filler-data-2 666 filler-data filler-data-2 555 filler-data filler-data-2 444 filler-data filler-data-2 333 filler-data filler-data-2 222 filler-data filler-data-2 set @maxv=1000;
select * from t1 where
(pk < 5) or (pk > 10and pk < 15) or (pk >= 50and pk < 55 ) or (pk > @maxv-10) or key1=18or key1=60;
pk key1 key2 filler filler2 100010001000 filler-data filler-data-2 999999999 filler-data filler-data-2 998998998 filler-data filler-data-2 997997997 filler-data filler-data-2 996996996 filler-data filler-data-2 995995995 filler-data filler-data-2 994994994 filler-data filler-data-2 993993993 filler-data filler-data-2 992992992 filler-data filler-data-2 991991991 filler-data filler-data-2 606060 filler-data filler-data-2 545454 filler-data filler-data-2 535353 filler-data filler-data-2 525252 filler-data filler-data-2 515151 filler-data filler-data-2 505050 filler-data filler-data-2 181818 filler-data filler-data-2 141414 filler-data filler-data-2 131313 filler-data filler-data-2 121212 filler-data filler-data-2 111111 filler-data filler-data-2 444 filler-data filler-data-2 333 filler-data filler-data-2 222 filler-data filler-data-2 111 filler-data filler-data-2
select * from t1 where
(pk < 5) or (pk > 10and pk < 15) or (pk >= 50and pk < 55 ) or (pk > @maxv-10) or key1 < 3or key1 > @maxv-11;
pk key1 key2 filler filler2 100010001000 filler-data filler-data-2 999999999 filler-data filler-data-2 998998998 filler-data filler-data-2 997997997 filler-data filler-data-2 996996996 filler-data filler-data-2 995995995 filler-data filler-data-2 994994994 filler-data filler-data-2 993993993 filler-data filler-data-2 992992992 filler-data filler-data-2 991991991 filler-data filler-data-2 990990990 filler-data filler-data-2 545454 filler-data filler-data-2 535353 filler-data filler-data-2 525252 filler-data filler-data-2 515151 filler-data filler-data-2 505050 filler-data filler-data-2 141414 filler-data filler-data-2 131313 filler-data filler-data-2 121212 filler-data filler-data-2 111111 filler-data filler-data-2 444 filler-data filler-data-2 333 filler-data filler-data-2 222 filler-data filler-data-2 111 filler-data filler-data-2
select * from t1 where
(pk < 5) or (pk > 10and pk < 15) or (pk >= 50and pk < 55 ) or (pk > @maxv-10) or
(key1 < 5) or (key1 > 10and key1 < 15) or (key1 >= 50and key1 < 55 ) or (key1 > @maxv-10);
pk key1 key2 filler filler2 100010001000 filler-data filler-data-2 999999999 filler-data filler-data-2 998998998 filler-data filler-data-2 997997997 filler-data filler-data-2 996996996 filler-data filler-data-2 995995995 filler-data filler-data-2 994994994 filler-data filler-data-2 993993993 filler-data filler-data-2 992992992 filler-data filler-data-2 991991991 filler-data filler-data-2 545454 filler-data filler-data-2 535353 filler-data filler-data-2 525252 filler-data filler-data-2 515151 filler-data filler-data-2 505050 filler-data filler-data-2 141414 filler-data filler-data-2 131313 filler-data filler-data-2 121212 filler-data filler-data-2 111111 filler-data filler-data-2 444 filler-data filler-data-2 333 filler-data filler-data-2 222 filler-data filler-data-2 111 filler-data filler-data-2
select * from t1 where
(pk > 10and pk < 15) or (pk >= 50and pk < 55 ) or
(key1 < 5) or (key1 > @maxv-10);
pk key1 key2 filler filler2 100010001000 filler-data filler-data-2 999999999 filler-data filler-data-2 998998998 filler-data filler-data-2 997997997 filler-data filler-data-2 996996996 filler-data filler-data-2 995995995 filler-data filler-data-2 994994994 filler-data filler-data-2 993993993 filler-data filler-data-2 992992992 filler-data filler-data-2 991991991 filler-data filler-data-2 545454 filler-data filler-data-2 535353 filler-data filler-data-2 525252 filler-data filler-data-2 515151 filler-data filler-data-2 505050 filler-data filler-data-2 141414 filler-data filler-data-2 131313 filler-data filler-data-2 121212 filler-data filler-data-2 111111 filler-data filler-data-2 444 filler-data filler-data-2 333 filler-data filler-data-2 222 filler-data filler-data-2 111 filler-data filler-data-2
drop table t1;
#---------------- Clustered PK ROR-index_merge tests -----------------------------
create table t1
(
pk1 int not null,
pk2 int not null,
key1 int not null,
key2 int not null,
pktail1ok int not null,
pktail2ok int not null,
pktail3bad int not null,
pktail4bad int not null,
pktail5bad int not null,
pk2copy int not null,
badkey int not null,
filler1 char (200),
filler2 char (200),
key (key1),
key (key2), /* keys with tails from CPK members */
key (pktail1ok, pk1),
key (pktail2ok, pk1, pk2),
key (pktail3bad, pk2, pk1),
key (pktail4bad, pk1, pk2copy),
key (pktail5bad, pk1, pk2, pk2copy),
primary key (pk1, pk2)
);
explain select * from t1 where pk1 = 1and pk2 < 80and key1=0;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range PRIMARY,key1 PRIMARY 8 NULL 7 Using index condition; Using where
select * from t1 where pk1 = 1and pk2 < 80and key1=0;
pk1 pk2 key1 key2 pktail1ok pktail2ok pktail3bad pktail4bad pktail5bad pk2copy badkey filler1 filler2 1100000000100 filler-data-10 filler2 1110000000110 filler-data-11 filler2 1120000000120 filler-data-12 filler2 1130000000130 filler-data-13 filler2 1140000000140 filler-data-14 filler2 1150000000150 filler-data-15 filler2 1160000000160 filler-data-16 filler2 1170000000170 filler-data-17 filler2 1180000000180 filler-data-18 filler2 1190000000190 filler-data-19 filler2
explain select pk1,pk2 from t1 where key1 = 10and key2=10and2*pk1+1 < 2*96+1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2 key1,key2 4,4 NULL 1 Using intersect(key1,key2); Using where
select pk1,pk2 from t1 where key1 = 10and key2=10and2*pk1+1 < 2*96+1;
pk1 pk2 9559 9558 9557 9556 9555 9554 9553 9552 9551 9550
explain select * from t1 where badkey=1and key1=10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref key1 key1 4 const 91 Using where set @tmp_index_merge_ror_cpk=@@optimizer_switch; set optimizer_switch='extended_keys=off';
explain select * from t1 where pk1 < 7500and key1 = 10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref PRIMARY,key1 key1 4 const ROWS Using where set optimizer_switch=@tmp_index_merge_ror_cpk;
explain select * from t1 where pktail1ok=1and key1=10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref key1,pktail1ok pktail1ok 4 const 76 Using where
explain select * from t1 where pktail2ok=1and key1=10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref key1,pktail2ok pktail2ok 4 const 82 Using where
explain select * from t1 where (pktail2ok=1and pk1< 50000) or key1=10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge PRIMARY,key1,pktail2ok pktail2ok,key1 8,4 NULL 173 Using sort_union(pktail2ok,key1); Using where
explain select * from t1 where pktail3bad=1and key1=10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref key1,pktail3bad pktail3bad 4 const 73 Using where
explain select * from t1 where pktail4bad=1and key1=10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref key1,pktail4bad pktail4bad 4 const 82 Using where
explain select * from t1 where pktail5bad=1and key1=10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref key1,pktail5bad pktail5bad 4 const 69 Using where
explain select pk1,pk2,key1,key2 from t1 where key1 = 10and key2=10 limit 10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge key1,key2 key1,key2 4,4 NULL 1 Using intersect(key1,key2); Using where
select pk1,pk2,key1,key2 from t1 where key1 = 10and key2=10 limit 10;
pk1 pk2 key1 key2 104491010 104481010 104471010 104461010 104451010 104441010 104431010 104421010 104411010 104401010
drop table t1;
create table t1
(
RUNID varchar(22),
SUBMITNR varchar(5),
ORDERNR char(1),
PROGRAMM varchar(8),
TESTID varchar(4),
UCCHECK char(1),
ETEXT varchar(80),
ETEXT_TYPE char(1),
INFO char(1),
SEVERITY tinyint(3),
TADIRFLAG char(1),
PRIMARY KEY (RUNID,SUBMITNR,ORDERNR,PROGRAMM,TESTID,UCCHECK),
KEY `TVERM~KEY` (PROGRAMM,TESTID,UCCHECK)
) DEFAULT CHARSET=latin1;
update t1 set `ETEXT` = '', `ETEXT_TYPE`='', `INFO`='', `SEVERITY`='', `TADIRFLAG`=''
WHERE
`RUNID`= ''AND `SUBMITNR`= ''AND `ORDERNR`=''AND `PROGRAMM`=''AND
`TESTID`=''AND `UCCHECK`='';
drop table t1;
#
# Bug#50402 Optimizer producing wrong results when using Index Merge on InnoDB
#
CREATE TABLE t1 (f1 INT, PRIMARY KEY (f1)) CHARSET=latin1;
INSERT INTO t1 VALUES (2);
CREATE TABLE t2 (f1 INT, f2 INT, f3 char(1),
PRIMARY KEY (f1), KEY (f2), KEY (f3)) CHARSET=latin1;
INSERT INTO t2 VALUES (1, 1, 'h'), (2, 3, 'h'), (3, 2, ''), (4, 2, '');
SELECT t1.f1 FROM t1
WHERE (SELECT COUNT(*) FROM t2 WHERE t2.f3 = 'h'AND t2.f2 = t1.f1) = 0AND t1.f1 = 2;
f1 2
EXPLAIN SELECT t1.f1 FROM t1
WHERE (SELECT COUNT(*) FROM t2 WHERE t2.f3 = 'h'AND t2.f2 = t1.f1) = 0AND t1.f1 = 2;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system PRIMARY NULL NULL NULL 1 2 SUBQUERY t2 index_merge f2,f3 f3,f2 2,5 NULL 1 Using intersect(f3,f2); Using where; Using index
DROP TABLE t1,t2;
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (a int, b int, c int, filler char(100),
key(a), key(b), key(c));
insert into t1 select
A.a * B.a*10 + C.a*100,
A.a * B.a*10 + C.a*100,
A.a, 'filler'
from t0 A, t0 B, t0 C;
This should use union:
explain select * from t1 where a=1or b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 2 Using union(a,b); Using where
This should use ALL: set optimizer_switch='default,index_merge=off,rowid_filter=off';
explain select * from t1 where a=1or b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL a,b NULL NULL NULL 1000 Using where
This should use sort-union: set optimizer_switch='default,index_merge_union=off,rowid_filter=off';
explain select * from t1 where a=1or b=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 2 Using sort_union(a,b); Using where
This will use sort-union: set optimizer_switch=default;
explain select * from t1 where a<1or b <1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 38 Using sort_union(a,b); Using where
This should use ALL: set optimizer_switch='default,index_merge_sort_union=off,rowid_filter=off';
explain select * from t1 where a<1or b <1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL a,b NULL NULL NULL 1000 Using where
This should use ALL: set optimizer_switch='default,index_merge=off,rowid_filter=off';
explain select * from t1 where a<1or b <1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL a,b NULL NULL NULL 1000 Using where
This will use sort-union: set optimizer_switch='default,index_merge_union=off,rowid_filter=off';
explain select * from t1 where a<1or b <1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 38 Using sort_union(a,b); Using where
alter table t1 add d int, add key(d);
update t1 set d=a;
This will use sort_union: set optimizer_switch=default;
explain select * from t1 where (a=3or b in (1,2)) and (c=3or d=4);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge a,b,c,d a,b 5,5 NULL 3 Using sort_union(a,b); Using where Andif we disable sort_union, union: set optimizer_switch='default,index_merge_sort_union=off,rowid_filter=off';
explain select * from t1 where (a=3or b in (1,2)) and (c=3or d=4);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge a,b,c,d c,d 5,5 NULL 100 Using union(c,d); Using where
drop table t1;
create table t1 (
a int, b int, c int,
filler1 char(200), filler2 char(200),
key(a),key(b),key(c)
);
insert into t1
select A.a+10*B.a, A.a+10*B.a, A.a+10*B.a+100*C.a, 'foo', 'bar'
from t0 A, t0 B, t0 C, t0 D where D.a<5;
This should be intersect: set optimizer_switch=default;
explain select * from t1 where a=10and b=10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 1 Using intersect(a,b); Using where
No intersect when index_merge is disabled: set optimizer_switch='default,index_merge=off,rowid_filter=off';
explain select * from t1 where a=10and b=10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref a,b a 5 const 49 Using where
No intersect if it is disabled: set optimizer_switch='default,index_merge_sort_intersection=off,index_merge_intersection=off,rowid_filter=off';
explain select * from t1 where a=10and b=10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref a,b a 5 const 49 Using where
Do intersect when union was disabled set optimizer_switch='default,index_merge_union=off,rowid_filter=off';
explain select * from t1 where a=10and b=10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 1 Using intersect(a,b); Using where
Do intersect when sort_union was disabled set optimizer_switch='default,index_merge_sort_union=off,rowid_filter=off';
explain select * from t1 where a=10and b=10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 1 Using intersect(a,b); Using where
This will use intersection inside a union: set optimizer_switch=default;
explain select * from t1 where a=10and b=10or c=10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge a,b,c a,b,c 5,5,5 NULL 6 Using union(intersect(a,b),c); Using where
Should be only union left: set optimizer_switch='default,index_merge_intersection=off,rowid_filter=off';
explain select * from t1 where a=10and b=10or c=10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge a,b,c a,c 5,5 NULL 54 Using union(a,c); Using where
This will switch to sort-union (intersection will be gone, too,
that's a known limitation: set optimizer_switch='default,index_merge_union=off,rowid_filter=off';
explain select * from t1 where a=10and b=10or c=10;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge a,b,c a,c 5,5 NULL 54 Using sort_union(a,c); Using where set optimizer_switch=default;
drop table t0, t1;
#
# BUG#834514 Assertion `!table || (!table->read_set || bitmap_is_set(...' with aggregates
#
CREATE TABLE t1 ( a int , b int, c int, KEY (b), PRIMARY KEY (a)) ;
INSERT INTO t1 VALUES (1,4,0),(5,0,0),(6,7,0),(7,7,0),(8,1,0),(9,7,0),(10,1,0);
CREATE TABLE t2 ( b int, c int, KEY (c,b)) ;
INSERT INTO t2 VALUES (7,0),(1,0),(7,0),(1,0);
CREATE TABLE t3 ( a int ) ;
SELECT COUNT(DISTINCT t2.b), CONCAT(t1.c)
FROM t1, t2
WHERE (t2.c = t1.c) AND (
t1.b IN ( 4 ) OR t1.a = 137 AND EXISTS ( SELECT a FROM t3 )
)
GROUP BY 2;
COUNT(DISTINCT t2.b) CONCAT(t1.c) 20
DROP TABLE t1,t2,t3;
#
# MDEV-4556 Server crashes in SEL_ARG::rb_insert with index_merge+index_merge_sort_union, FORCE INDEX
#
CREATE TABLE t1 (
pk int,
code char(2),
population_rate int,
area_rate int,
primary key (pk),
index (code),
key (population_rate),
key (area_rate)
);
INSERT INTO t1 VALUES (1,'WI',20, 23), (2, 'WA', 13, 18);
EXPLAIN
SELECT * FROM t1 FORCE INDEX ( PRIMARY, population_rate, area_rate, code )
WHERE pk = 1OR population_rate = 1OR ( area_rate IN ( 1,2 ) OR area_rate IS NULL ) AND (population_rate = 25OR area_rate BETWEEN 2AND25OR code BETWEEN 'MA'AND'TX');
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge PRIMARY,code,population_rate,area_rate PRIMARY,population_rate,area_rate,code 4,5,5,3 NULL 2 Using sort_union(PRIMARY,population_rate,area_rate,code); Using where
SELECT * FROM t1 FORCE INDEX ( PRIMARY, population_rate, area_rate, code )
WHERE pk = 1OR population_rate = 1OR ( area_rate IN ( 1,2 ) OR area_rate IS NULL ) AND (population_rate = 25OR area_rate BETWEEN 2AND25OR code BETWEEN 'MA'AND'TX');
pk code population_rate area_rate 1 WI 2023
DROP TABLE t1;
#
# MDEV-5069: Server crashes in SEL_ARG::increment_use_count with index_merge+index_merge_sort_union, FORCE INDEX
#
CREATE TABLE t1 (
c1 varchar(64),
i int,
pk integer auto_increment,
c2 varchar(64),
index (c1),
index (i),
primary key (pk),
key (c2)) ENGINE=myisam;
ALTER TABLE t1 DISABLE KEYS;
INSERT INTO t1 VALUES
('West Virginia', 6121, NULL, 'California'),('Georgia', 60177, NULL, 'Arkansas'),
('Delaware', 90, NULL, 'Oregon'),('Wyoming', 7, NULL, 'Missouri'),( 'Delaware', 2, NULL, 'Utah'),('Wisconsin', 0, NULL, 'Iowa'),
('Kansas', 0, NULL, 'Florida'),('Ohio', 34358, NULL, 'Colorado'),
('Maine', 118, NULL, 'Texas'),('Mississippi', 0, NULL, 'Georgia'),
('Tennessee', 4, NULL, 'N/A'),('Georgia', 0, NULL, 'New Hampshire'),
('Wyoming', 2, NULL, 'N/A'),('Florida', 0, NULL, 'Arizona'),
('Rhode Island', -24002, NULL, 'Michigan'),('Alabama', 142, NULL, 'Indiana'),
('Colorado', 0, NULL, 'Louisiana'),('Michigan', 21194, NULL, 'Louisiana'),
('Oklahoma', 31475, NULL, 'Alabama'),('Pennsylvania', 0, NULL, 'Oklahoma'),
('Texas', 0, NULL, 'Texas'),('West Virginia', 5, NULL, 'Utah'),
('Florida', 49653, NULL, 'Kentucky'),('Tennessee', 19075, NULL, 'Oregon'),
('Maine', 3, NULL, 'Kansas, Kentucky, Iowa'),('Iowa', 1, NULL, 'South Dakota'),
('Kansas', -4037, NULL, 'Virginia'),('Delaware', 22550, NULL, 'Utah'),
('Illinois', 14634, NULL, 'South Carolina, Colorado'),
('Kansas', 6, NULL, 'South Dakota'),('Delaware', 9, NULL, ''),
('', 0, NULL, 'Utah, Delaware, Florida, Georgia, Nevada'),
('Colorado', 8, NULL, 'Montana'),('Maryland', 2689, NULL, 'Hawaii'),
('Florida', -12306, NULL, 'Delaware'),
('Indiana', 38567, NULL, 'Iowa, Minnesota, Maine'),
('Oklahoma', 9, NULL, 'Delaware, Kansas, Oregon, Nebraska, Maryland, Minnesota'),
('Tennessee', 12460, NULL, NULL),('Kentucky', 0, NULL, 'Ohio'),
('Nevada', 7, NULL, 'Vermont, Oregon, Oklahoma, Montana'),
('Nebraska', 61966, NULL, 'Nevada'),('Alaska', 131, NULL, 'Louisiana, Maine'),
('Wisconsin', 4, NULL, 'Nevada'),('South Carolina', 0, NULL, 'Washington'),
('West Virginia', 51314, NULL, 'Ohio'),('Louisiana', 0, NULL, ''),
('Pennsylvania', 0, NULL, 'Iowa, Idaho'),('Arkansas', 14010, NULL, 'Indiana'),
('Wyoming', -15514, NULL, 'Maine'),('Georgia', 0, NULL, 'N/A'),
('Kentucky', 1, NULL, 'Idaho'),('Wyoming', 60249, NULL, 'Indiana, Iowa'),
('Pennsylvania', 69, NULL, 'W'),
('New Mexico', 11480, NULL, 'Florida, Georgia, Hawaii'),
('South Carolina', 9, NULL, 'Iowa'),('Virginia', 0, NULL, 'Connecticut'),
('Mississippi', 19749, NULL, 'Rhode Island'),('Illinois', 5, NULL, 'Virginia'),
('Texas', -1749, NULL, 'Tennessee'),('Arizona', 28, NULL, 'California'),
('Florida', 62151, NULL, 'Kansas'),('California', 172, NULL, 'SC'),
('New Jersey', 0, NULL, 'North Carolina'),('Wyoming', 4, NULL, 'I'),
('Kansas', 10683, NULL, 'California'),('Arkansas', -14275, NULL, 'K'),
('Arizona', 5, NULL, 'California, Delaware, Rhode Island, Maryland'),
('Florida', 0, NULL, 'T'),('Alaska', 241, NULL, 'Virginia');
ALTER TABLE t1 ENABLE KEYS;
EXPLAIN
SELECT * FROM t1 FORCE KEY (PRIMARY , i , c1 , c2)
WHERE pk = 255OR i = 22OR (pk IN (1 , 136) AND c2 IN ('c' , 'w') AND (c1 NOT BETWEEN 'e'AND'i'OR c2 > 'g')) OR (pk is not null and (pk <1or pk>1)) ;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL PRIMARY,c1,i,c2 NULL NULL NULL 69 Using where
DROP TABLE t1; set optimizer_switch= @optimizer_switch_save;
#
# MDEV-21932: ROR union with index_merge_sort_union=off
#
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
insert into t0 select a+10 from t0;
insert into t0 select a+20 from t0;
insert into t0 select a+40 from t0;
insert into t0 select a+80 from t0;
insert into t0 select a+160 from t0;
delete from t0 where a > 300;
create table t1 (
f1 int, f2 int, f3 int, f4 int,
primary key (f1), key (f3), key(f4)
) engine=myisam;
insert into t1 select a+100, a+100, a+100, a+100 from t0;
insert into t1 VALUES (9,0,2,6), (9930,0,0,NULL);
analyze table t1;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK set optimizer_switch='index_merge_sort_union=off'; set optimizer_switch='index_merge_union=on';
explain select * from t1
where (( f3 = 1or f1 = 7 ) and f1 < 10) or
(f3 between 2and2and ( f3 = 1or f4 < 7 ));
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge PRIMARY,f3,f4 f3,PRIMARY,f3 5,4,5 NULL 3 Using union(f3,PRIMARY,f3); Using where
select * from t1
where (( f3 = 1or f1 = 7 ) and f1 < 10) or
(f3 between 2and2and ( f3 = 1or f4 < 7 ));
f1 f2 f3 f4 9026
insert into t1 values (52,0,1,0),(53,0,1,0);
insert into t1 values (50,0,1,0),(51,0,1,0);
insert into t1 values (48,0,1,0),(49,0,1,0);
insert into t1 values (46,0,1,0),(47,0,1,0);
insert into t1 values (44,0,1,0),(45,0,1,0);
analyze table t1;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
explain select * from t1
where (( f3 = 1or f1 = 7 ) and f1 < 10) or
(f3 between 2and2and ( f3 = 1or f4 < 7 ));
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge PRIMARY,f3,f4 f3,PRIMARY,f3 5,4,5 NULL 13 Using union(f3,PRIMARY,f3); Using where
select * from t1
where (( f3 = 1or f1 = 7 ) and f1 < 10) or
(f3 between 2and2and ( f3 = 1or f4 < 7 ));
f1 f2 f3 f4 9026
drop table t0,t1; set optimizer_switch= @optimizer_switch_save;
#
# MDEV-16695: Estimate for rows of derived tables is very high when we are using index_merge union
#
create table t0
(
key1 int not null,
INDEX i1(key1)
);
insert into t0 select * from seq_1_to_1024;
alter table t0 add key2 int not null, add index i2(key2);
alter table t0 add key3 int not null, add index i3(key3);
alter table t0 add key8 int not null, add index i8(key8);
update t0 set key2=key1,key3=key1,key8=1024-key1;
analyze table t0;
Table Op Msg_type Msg_text
test.t0 analyze status Engine-independent statistics collected
test.t0 analyze status OK set @optimizer_switch_save=@@optimizer_switch; set optimizer_switch='derived_merge=off,derived_with_keys=off';
explain select * from (select * from t0 where key1 = 3or key2 =3) as Z where Z.key8 > 5;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2 Using where 2 DERIVED t0 index_merge i1,i2,i8 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where
select * from (select * from t0 where key1 = 3or key2 =3) as Z where Z.key8 > 5;
key1 key2 key3 key8 3331021 set optimizer_use_condition_selectivity=2;
explain select * from (select * from t0 where key1 = 3or key2 =3) as Z where Z.key8 > 5;
id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2 Using where 2 DERIVED t0 index_merge i1,i2,i8 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where
select * from (select * from t0 where key1 = 3or key2 =3) as Z where Z.key8 > 5;
key1 key2 key3 key8 3331021 set @@optimizer_switch= @optimizer_switch_save;
drop table t0;
# End of 10.1 tests
ALTER DATABASE test CHARACTER SET utf8mb4 COLLATE utf8mb4_uca1400_ai_ci;
Messung V0.5 in Prozent
¤ Dauer der Verarbeitung: 0.37 Sekunden
(vorverarbeitet am 2026-10-08)
¤
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.