set @@join_buffer_size=256*1024;
create table t1 (a int, b int) engine=MyISAM;
create table t2 (c int, d int) engine=MyISAM;
insert into t1 values (1,1),(2,2);
insert into t2 values (2,2),(3,3);
(select a,b from t1) except (select c,d from t2);
a b
1 1
EXPLAIN (select a,b from t1) except (select c,d from t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 
2 EXCEPT t2 ALL NULL NULL NULL NULL 2 
NULL EXCEPT RESULT <except1,2> ALL NULL NULL NULL NULL NULL 
EXPLAIN extended (select a,b from t1) except (select c,d from t2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00 
2 EXCEPT t2 ALL NULL NULL NULL NULL 2 100.00 
NULL EXCEPT RESULT <except1,2> ALL NULL NULL NULL NULL NULL NULL 
Warnings:
Note 1003 (/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1`) except (/* select#2 */ select `test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2`)
EXPLAIN extended select * from ((select a,b from t1) except (select c,d from t2)) a;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2 100.00 
2 DERIVED t1 ALL NULL NULL NULL NULL 2 100.00 
3 EXCEPT t2 ALL NULL NULL NULL NULL 2 100.00 
NULL EXCEPT RESULT <except2,3> ALL NULL NULL NULL NULL NULL NULL 
Warnings:
Note 1003 /* select#1 */ select `a`.`a` AS `a`,`a`.`b` AS `b` from ((/* select#2 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1`) except (/* select#3 */ select `test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2`)) `a`
EXPLAIN format=json (select a,b from t1) except (select c,d from t2);
EXPLAIN
{
  "query_block": {
    "union_result": {
      "table_name": "<except1,2>",
      "access_type": "ALL",
      "query_specifications": [
        {
          "query_block": {
            "select_id": 1,
            "cost": "REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t1",
                  "access_type": "ALL",
                  "loops": 1,
                  "rows": 2,
                  "cost": "REPLACED",
                  "filtered": 100
                }
              }
            ]
          }
        },
        {
          "query_block": {
            "select_id": 2,
            "operation": "EXCEPT",
            "cost": "REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t2",
                  "access_type": "ALL",
                  "loops": 1,
                  "rows": 2,
                  "cost": "REPLACED",
                  "filtered": 100
                }
              }
            ]
          }
        }
      ]
    }
  }
}
ANALYZE format=json (select a,b from t1) except (select c,d from t2);
ANALYZE
{
  "query_optimization": {
    "r_total_time_ms": "REPLACED"
  },
  "query_block": {
    "union_result": {
      "table_name": "<except1,2>",
      "access_type": "ALL",
      "r_loops": 1,
      "r_rows": 1,
      "query_specifications": [
        {
          "query_block": {
            "select_id": 1,
            "cost": "REPLACED",
            "r_loops": 1,
            "r_total_time_ms": "REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t1",
                  "access_type": "ALL",
                  "loops": 1,
                  "r_loops": 1,
                  "rows": 2,
                  "r_rows": 2,
                  "cost": "REPLACED",
                  "r_table_time_ms": "REPLACED",
                  "r_other_time_ms": "REPLACED",
                  "r_engine_stats": REPLACED,
                  "filtered": 100,
                  "r_total_filtered": 100,
                  "r_filtered": 100
                }
              }
            ]
          }
        },
        {
          "query_block": {
            "select_id": 2,
            "operation": "EXCEPT",
            "cost": "REPLACED",
            "r_loops": 1,
            "r_total_time_ms": "REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t2",
                  "access_type": "ALL",
                  "loops": 1,
                  "r_loops": 1,
                  "rows": 2,
                  "r_rows": 2,
                  "cost": "REPLACED",
                  "r_table_time_ms": "REPLACED",
                  "r_other_time_ms": "REPLACED",
                  "r_engine_stats": REPLACED,
                  "filtered": 100,
                  "r_total_filtered": 100,
                  "r_filtered": 100
                }
              }
            ]
          }
        }
      ]
    }
  }
}
ANALYZE format=json select * from ((select a,b from t1) except (select c,d from t2)) a;
ANALYZE
{
  "query_optimization": {
    "r_total_time_ms": "REPLACED"
  },
  "query_block": {
    "select_id": 1,
    "cost": "REPLACED",
    "r_loops": 1,
    "r_total_time_ms": "REPLACED",
    "nested_loop": [
      {
        "table": {
          "table_name": "<derived2>",
          "access_type": "ALL",
          "loops": 1,
          "r_loops": 1,
          "rows": 2,
          "r_rows": 1,
          "cost": "REPLACED",
          "r_table_time_ms": "REPLACED",
          "r_other_time_ms": "REPLACED",
          "filtered": 100,
          "r_total_filtered": 100,
          "r_filtered": 100,
          "materialized": {
            "query_block": {
              "union_result": {
                "table_name": "<except2,3>",
                "access_type": "ALL",
                "r_loops": 1,
                "r_rows": 1,
                "query_specifications": [
                  {
                    "query_block": {
                      "select_id": 2,
                      "cost": "REPLACED",
                      "r_loops": 1,
                      "r_total_time_ms": "REPLACED",
                      "nested_loop": [
                        {
                          "table": {
                            "table_name": "t1",
                            "access_type": "ALL",
                            "loops": 1,
                            "r_loops": 1,
                            "rows": 2,
                            "r_rows": 2,
                            "cost": "REPLACED",
                            "r_table_time_ms": "REPLACED",
                            "r_other_time_ms": "REPLACED",
                            "r_engine_stats": REPLACED,
                            "filtered": 100,
                            "r_total_filtered": 100,
                            "r_filtered": 100
                          }
                        }
                      ]
                    }
                  },
                  {
                    "query_block": {
                      "select_id": 3,
                      "operation": "EXCEPT",
                      "cost": "REPLACED",
                      "r_loops": 1,
                      "r_total_time_ms": "REPLACED",
                      "nested_loop": [
                        {
                          "table": {
                            "table_name": "t2",
                            "access_type": "ALL",
                            "loops": 1,
                            "r_loops": 1,
                            "rows": 2,
                            "r_rows": 2,
                            "cost": "REPLACED",
                            "r_table_time_ms": "REPLACED",
                            "r_other_time_ms": "REPLACED",
                            "r_engine_stats": REPLACED,
                            "filtered": 100,
                            "r_total_filtered": 100,
                            "r_filtered": 100
                          }
                        }
                      ]
                    }
                  }
                ]
              }
            }
          }
        }
      }
    ]
  }
}
select * from ((select a,b from t1) except (select c,d from t2)) a;
a b
1 1
prepare stmt from "(select a,b from t1) except (select c,d from t2)";
execute stmt;
a b
1 1
execute stmt;
a b
1 1
prepare stmt from "select * from ((select a,b from t1) except (select c,d from t2)) a";
execute stmt;
a b
1 1
execute stmt;
a b
1 1
drop tables t1,t2;
create table t1 (a int, b int) engine=MyISAM;
create table t2 (c int, d int) engine=MyISAM;
create table t3 (e int, f int) engine=MyISAM;
create table t4 (g int, h int) engine=MyISAM;
insert into t1 values (1,1),(2,2);
insert into t2 values (2,2),(3,3);
insert into t3 values (4,4),(5,5);
insert into t4 values (4,4),(7,7);
(select a,b,e,f from t1,t3) except (select c,d,g,h from t2,t4);
a b e f
1 1 4 4
1 1 5 5
2 2 5 5
EXPLAIN (select a,b,e,f from t1,t3) except (select c,d,g,h from t2,t4);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 
1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
2 EXCEPT t2 ALL NULL NULL NULL NULL 2 
2 EXCEPT t4 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
NULL EXCEPT RESULT <except1,2> ALL NULL NULL NULL NULL NULL 
EXPLAIN (select a,b,e,f from t1,t3) except (select c,d,g,h from t2,t4);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 
1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
2 EXCEPT t2 ALL NULL NULL NULL NULL 2 
2 EXCEPT t4 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
NULL EXCEPT RESULT <except1,2> ALL NULL NULL NULL NULL NULL 
EXPLAIN extended select * from ((select a,b,e,f from t1,t3) except (select c,d,g,h from t2,t4)) a;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 100.00 
2 DERIVED t1 ALL NULL NULL NULL NULL 2 100.00 
2 DERIVED t3 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join)
3 EXCEPT t2 ALL NULL NULL NULL NULL 2 100.00 
3 EXCEPT t4 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join)
NULL EXCEPT RESULT <except2,3> ALL NULL NULL NULL NULL NULL NULL 
Warnings:
Note 1003 /* select#1 */ select `a`.`a` AS `a`,`a`.`b` AS `b`,`a`.`e` AS `e`,`a`.`f` AS `f` from ((/* select#2 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t3`.`e` AS `e`,`test`.`t3`.`f` AS `f` from `test`.`t1` join `test`.`t3`) except (/* select#3 */ select `test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d`,`test`.`t4`.`g` AS `g`,`test`.`t4`.`h` AS `h` from `test`.`t2` join `test`.`t4`)) `a`
EXPLAIN format=json (select a,b,e,f from t1,t3) except (select c,d,g,h from t2,t4);
EXPLAIN
{
  "query_block": {
    "union_result": {
      "table_name": "<except1,2>",
      "access_type": "ALL",
      "query_specifications": [
        {
          "query_block": {
            "select_id": 1,
            "cost": "REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t1",
                  "access_type": "ALL",
                  "loops": 1,
                  "rows": 2,
                  "cost": "REPLACED",
                  "filtered": 100
                }
              },
              {
                "block-nl-join": {
                  "table": {
                    "table_name": "t3",
                    "access_type": "ALL",
                    "loops": 2,
                    "rows": 2,
                    "cost": "REPLACED",
                    "filtered": 100
                  },
                  "buffer_type": "flat",
                  "buffer_size": "119",
                  "join_type": "BNL"
                }
              }
            ]
          }
        },
        {
          "query_block": {
            "select_id": 2,
            "operation": "EXCEPT",
            "cost": "REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t2",
                  "access_type": "ALL",
                  "loops": 1,
                  "rows": 2,
                  "cost": "REPLACED",
                  "filtered": 100
                }
              },
              {
                "block-nl-join": {
                  "table": {
                    "table_name": "t4",
                    "access_type": "ALL",
                    "loops": 2,
                    "rows": 2,
                    "cost": "REPLACED",
                    "filtered": 100
                  },
                  "buffer_type": "flat",
                  "buffer_size": "119",
                  "join_type": "BNL"
                }
              }
            ]
          }
        }
      ]
    }
  }
}
ANALYZE format=json (select a,b,e,f from t1,t3) except (select c,d,g,h from t2,t4);
ANALYZE
{
  "query_optimization": {
    "r_total_time_ms": "REPLACED"
  },
  "query_block": {
    "union_result": {
      "table_name": "<except1,2>",
      "access_type": "ALL",
      "r_loops": 1,
      "r_rows": 3,
      "query_specifications": [
        {
          "query_block": {
            "select_id": 1,
            "cost": "REPLACED",
            "r_loops": 1,
            "r_total_time_ms": "REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t1",
                  "access_type": "ALL",
                  "loops": 1,
                  "r_loops": 1,
                  "rows": 2,
                  "r_rows": 2,
                  "cost": "REPLACED",
                  "r_table_time_ms": "REPLACED",
                  "r_other_time_ms": "REPLACED",
                  "r_engine_stats": REPLACED,
                  "filtered": 100,
                  "r_total_filtered": 100,
                  "r_filtered": 100
                }
              },
              {
                "block-nl-join": {
                  "table": {
                    "table_name": "t3",
                    "access_type": "ALL",
                    "loops": 2,
                    "r_loops": 1,
                    "rows": 2,
                    "r_rows": 2,
                    "cost": "REPLACED",
                    "r_table_time_ms": "REPLACED",
                    "r_other_time_ms": "REPLACED",
                    "r_engine_stats": REPLACED,
                    "filtered": 100,
                    "r_total_filtered": 100,
                    "r_filtered": 100
                  },
                  "buffer_type": "flat",
                  "buffer_size": "119",
                  "join_type": "BNL",
                  "r_loops": 2,
                  "r_filtered": 100,
                  "r_unpack_time_ms": "REPLACED",
                  "r_other_time_ms": "REPLACED",
                  "r_effective_rows": 2
                }
              }
            ]
          }
        },
        {
          "query_block": {
            "select_id": 2,
            "operation": "EXCEPT",
            "cost": "REPLACED",
            "r_loops": 1,
            "r_total_time_ms": "REPLACED",
            "nested_loop": [
              {
                "table": {
                  "table_name": "t2",
                  "access_type": "ALL",
                  "loops": 1,
                  "r_loops": 1,
                  "rows": 2,
                  "r_rows": 2,
                  "cost": "REPLACED",
                  "r_table_time_ms": "REPLACED",
                  "r_other_time_ms": "REPLACED",
                  "r_engine_stats": REPLACED,
                  "filtered": 100,
                  "r_total_filtered": 100,
                  "r_filtered": 100
                }
              },
              {
                "block-nl-join": {
                  "table": {
                    "table_name": "t4",
                    "access_type": "ALL",
                    "loops": 2,
                    "r_loops": 1,
                    "rows": 2,
                    "r_rows": 2,
                    "cost": "REPLACED",
                    "r_table_time_ms": "REPLACED",
                    "r_other_time_ms": "REPLACED",
                    "r_engine_stats": REPLACED,
                    "filtered": 100,
                    "r_total_filtered": 100,
                    "r_filtered": 100
                  },
                  "buffer_type": "flat",
                  "buffer_size": "119",
                  "join_type": "BNL",
                  "r_loops": 2,
                  "r_filtered": 100,
                  "r_unpack_time_ms": "REPLACED",
                  "r_other_time_ms": "REPLACED",
                  "r_effective_rows": 2
                }
              }
            ]
          }
        }
      ]
    }
  }
}
ANALYZE format=json select * from ((select a,b,e,f from t1,t3) except
(select c,d,g,h from t2,t4)) a;
ANALYZE
{
  "query_optimization": {
    "r_total_time_ms": "REPLACED"
  },
  "query_block": {
    "select_id": 1,
    "cost": "REPLACED",
    "r_loops": 1,
    "r_total_time_ms": "REPLACED",
    "nested_loop": [
      {
        "table": {
          "table_name": "<derived2>",
          "access_type": "ALL",
          "loops": 1,
          "r_loops": 1,
          "rows": 4,
          "r_rows": 3,
          "cost": "REPLACED",
          "r_table_time_ms": "REPLACED",
          "r_other_time_ms": "REPLACED",
          "filtered": 100,
          "r_total_filtered": 100,
          "r_filtered": 100,
          "materialized": {
            "query_block": {
              "union_result": {
                "table_name": "<except2,3>",
                "access_type": "ALL",
                "r_loops": 1,
                "r_rows": 3,
                "query_specifications": [
                  {
                    "query_block": {
                      "select_id": 2,
                      "cost": "REPLACED",
                      "r_loops": 1,
                      "r_total_time_ms": "REPLACED",
                      "nested_loop": [
                        {
                          "table": {
                            "table_name": "t1",
                            "access_type": "ALL",
                            "loops": 1,
                            "r_loops": 1,
                            "rows": 2,
                            "r_rows": 2,
                            "cost": "REPLACED",
                            "r_table_time_ms": "REPLACED",
                            "r_other_time_ms": "REPLACED",
                            "r_engine_stats": REPLACED,
                            "filtered": 100,
                            "r_total_filtered": 100,
                            "r_filtered": 100
                          }
                        },
                        {
                          "block-nl-join": {
                            "table": {
                              "table_name": "t3",
                              "access_type": "ALL",
                              "loops": 2,
                              "r_loops": 1,
                              "rows": 2,
                              "r_rows": 2,
                              "cost": "REPLACED",
                              "r_table_time_ms": "REPLACED",
                              "r_other_time_ms": "REPLACED",
                              "r_engine_stats": REPLACED,
                              "filtered": 100,
                              "r_total_filtered": 100,
                              "r_filtered": 100
                            },
                            "buffer_type": "flat",
                            "buffer_size": "119",
                            "join_type": "BNL",
                            "r_loops": 2,
                            "r_filtered": 100,
                            "r_unpack_time_ms": "REPLACED",
                            "r_other_time_ms": "REPLACED",
                            "r_effective_rows": 2
                          }
                        }
                      ]
                    }
                  },
                  {
                    "query_block": {
                      "select_id": 3,
                      "operation": "EXCEPT",
                      "cost": "REPLACED",
                      "r_loops": 1,
                      "r_total_time_ms": "REPLACED",
                      "nested_loop": [
                        {
                          "table": {
                            "table_name": "t2",
                            "access_type": "ALL",
                            "loops": 1,
                            "r_loops": 1,
                            "rows": 2,
                            "r_rows": 2,
                            "cost": "REPLACED",
                            "r_table_time_ms": "REPLACED",
                            "r_other_time_ms": "REPLACED",
                            "r_engine_stats": REPLACED,
                            "filtered": 100,
                            "r_total_filtered": 100,
                            "r_filtered": 100
                          }
                        },
                        {
                          "block-nl-join": {
                            "table": {
                              "table_name": "t4",
                              "access_type": "ALL",
                              "loops": 2,
                              "r_loops": 1,
                              "rows": 2,
                              "r_rows": 2,
                              "cost": "REPLACED",
                              "r_table_time_ms": "REPLACED",
                              "r_other_time_ms": "REPLACED",
                              "r_engine_stats": REPLACED,
                              "filtered": 100,
                              "r_total_filtered": 100,
                              "r_filtered": 100
                            },
                            "buffer_type": "flat",
                            "buffer_size": "119",
                            "join_type": "BNL",
                            "r_loops": 2,
                            "r_filtered": 100,
                            "r_unpack_time_ms": "REPLACED",
                            "r_other_time_ms": "REPLACED",
                            "r_effective_rows": 2
                          }
                        }
                      ]
                    }
                  }
                ]
              }
            }
          }
        }
      }
    ]
  }
}
select * from ((select a,b,e,f from t1,t3) except (select c,d,g,h from t2,t4)) a;
a b e f
1 1 4 4
1 1 5 5
2 2 5 5
prepare stmt from "(select a,b,e,f from t1,t3) except (select c,d,g,h from t2,t4)";
execute stmt;
a b e f
1 1 4 4
1 1 5 5
2 2 5 5
execute stmt;
a b e f
1 1 4 4
1 1 5 5
2 2 5 5
prepare stmt from "select * from ((select a,b,e,f from t1,t3) except (select c,d,g,h from t2,t4)) a";
execute stmt;
a b e f
1 1 4 4
1 1 5 5
2 2 5 5
execute stmt;
a b e f
1 1 4 4
1 1 5 5
2 2 5 5
drop tables t1,t2,t3,t4;
select 1 as a from dual except select 1 from dual;
a
(select 1 from dual) except (select 1 from dual);
1
(select 1 from dual into @v) except (select 1 from dual);
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'into @v) except (select 1 from dual)' at line 1
select 1 from dual ORDER BY 1 except select 1 from dual;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'except select 1 from dual' at line 1
select 1 as a from dual union all select 1 from dual;
a
1
1
create table t1 (a int, b blob, a1 int, b1 blob) engine=MyISAM;
create table t2 (c int, d blob, c1 int, d1 blob) engine=MyISAM;
insert into t1 values (1,"ddd", 1, "sdfrrwwww"),(2, "fgh", 2, "dffggtt");
insert into t2 values (2, "fgh", 2, "dffggtt"),(3, "ffggddd", 3, "dfgg");
(select a,b,b1 from t1) except (select c,d,d1 from t2);
a b b1
1 ddd sdfrrwwww
create table t3 (select a,b,b1 from t1) except (select c,d,d1 from t2);
show create table t3;
Table Create Table
t3 CREATE TABLE `t3` (
  `a` int(11) DEFAULT NULL,
  `b` blob DEFAULT NULL,
  `b1` blob DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
drop tables t1,t2,t3;
#
# MDEV-13723: Server crashes in ha_heap::find_unique_row or
# Assertion `0' failed in st_select_lex_unit::optimize with INTERSECT
#
CREATE TABLE t (i INT);
INSERT INTO t VALUES (1),(2);
SELECT * FROM t WHERE i != ANY ( SELECT 3 EXCEPT SELECT 3 );
i
drop table t;
# End of 10.3 tests