SET CONSTRAINTS设置当前事务的约束检查模式。SET CONSTRAINTS { ALL | name [, ...] } { DEFERRED | IMMEDIATE }SET SESSION AUTHORIZATION为当前会话设置会话用户标识符和当前用户标识符。SET [ SESSION | LOCAL ] SESSION AUTHORIZATION username SET [ SESSION | LOCAL ] SESSION AUTHORIZATION DEFAULT RESET ...
postgres=# set constraints all deferred; SET CONSTRAINTS postgres=# insert into t2 (a,b,c) values (3,3,'cc'); INSERT 0 1 postgres=# insert into t2 (a,b,c) values (4,4,'dd'); INSERT 0 1 postgres=# insert into t1 (a,b,c) values (3,'cc',now()); INSERT 0 1 postgres=...
SET CONSTRAINTS { ALL | name [, ...] } { DEFERRED | IMMEDIATE } SET SESSION AUTHORIZATION 为当前会话设置会话用户标识符和当前用户标识符。 SET [ SESSION | LOCAL ] SESSION AUTHORIZATION username SET [ SESSION | LOCAL ] SESSION AUTHORIZATION DEFAULT RESET SESSION AUTHORIZATION SET TRANSACTION 开始...
SQL Server 基础入门 MySQL 应用管理实战 SQL Server 数据库管理实战 在线学习中心课程PostgreSQL 教程 1分钟 PostgreSQL 命令-SET CONSTRAINTS 设置当前事务的约束检查模式。 SETCONSTRAINTS{ALL|name[,...]}{DEFERRED|IMMEDIATE} 上一节: PostgreSQL 命令-SET下一节: PostgreSQL 命令-SET SESSION AUTHORIZATION...
[, ...] | ALL [ PRIVILEGES ] } ON TABLES TO { [ GROUP ] role_name | PUBLIC } [, ...] [ WITH GRANT OPTION ] ... ALTER DOMAIN 修改一个域的定义。 ALTER DOMAIN name { SET DEFAULT expression | DROP DEFAULT } ALTER DOMAIN name { SET | DROP } NOT NULL ...
SET CONSTRAINTS ALL 更改所有可延迟约束的模式。 当SET CONSTRAINTS把一个约束的模式从 DEFERRED改成IMMEDIATE时, 新模式会有追溯效果:任何还没有解决的数据修改(本来会在事务结束时被检查)会转而在SET CONSTRAINTS命令的执行期间被检查。如果任何这种约束被违背, SET CONSTRAINTS将会失败(并且不会改变该约束模式)。
目前,我正在尝试截断具有Postgresql11.3外键约束的表。SET CONSTRAINTS ALL DEFERRED不会关闭外键约束检查吗?是否存在不触发外键约束检查且不涉及级联的情况下截断表? 浏览0提问于2019-06-21得票数23 1回答 对于没有返回预期响应的API调用,我需要一些指导
vacuum_defer_cleanup_age | 0 | Number of transactions by which VACUUM and HOT cleanup should be deferred, if any. vacuum_freeze_min_age | 50000000 | Minimum age at which VACUUM should freeze a table row. vacuum_freeze_table_age | 150000000 | Age at which VACUUM should scan whole table ...
They can be fired either at the end of the statement causing the triggering event, or at the end of the containing transaction; in the latter case they are said to be deferred. A pending deferred-trigger firing can also be forced to happen immediately by using SET CONSTRAINTS. Constraint ...
Command:CREATETRIGGERDescription:define anewtriggerSyntax:CREATE[CONSTRAINT]TRIGGERname{BEFORE|AFTER|INSTEADOF}{event[OR...]}ONtable_name[FROMreferenced_table_name]{NOTDEFERRABLE|[DEFERRABLE]{INITIALLYIMMEDIATE|INITIALLYDEFERRED}}[FOR[EACH]{ROW|STATEMENT}][WHEN(condition)]EXECUTEPROCEDUREfunction_name(argume...