create table t (
a int,
b int without system versioning
) with system versioning;
insert into t values(1, 2);
insert into t values(3, 4);
select * from t;
a b 12 34
select a from t for system_time as of timestamp now(6);
a 1 3
select a, b, b+0 from t for system_time as of timestamp now(6);
a b b+0 122 344
select * from t for system_time as of timestamp now(6);
a b 12 34
select count(*) from t for system_time as of timestamp now(6) group by b;
count(*) 1 1
select * from t for system_time as of timestamp now(6) order by b asc;
a b 12 34
select * from t for system_time as of timestamp now(6) order by b desc;
a b 34 12
select * from t for system_time as of timestamp now(6) group by a having a=2;
a b
select * from t for system_time as of timestamp now(6) group by b having b=2;
a b 12
select a from t for system_time as of timestamp now(6) where b=2;
a 1
select a from t for system_time as of timestamp now(6) where b=NULL;
a
select a from t for system_time as of timestamp now(6) where b is NULL;
a
select count(*), b from t for system_time as of timestamp now(6) group by b having b=NULL;
count(*) b
select a, b from t;
a b 12 34
create orreplace table t (
a int,
b int not null without system versioning
) with system versioning;
insert into t values (1, 2), (3, 4);
select * from t for system_time as of timestamp now(6);
a b 12 34
select * from t for system_time as of timestamp now(6) where b is NULL;
a b
create orreplace table t (x int with system versioning, y int);
select column_name, extra from information_schema.columns where table_name='t';
column_name extra
x
y WITHOUT SYSTEM VERSIONING
show create table t;
Table Create Table
t CREATE TABLE `t` (
`x` int(11) DEFAULT NULL,
`y` int(11) DEFAULT NULL WITHOUT SYSTEM VERSIONING
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci WITH SYSTEM VERSIONING
drop table t;
Messung V0.5 in Prozent
¤ Dauer der Verarbeitung: 0.9 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.