TRUNCATE是 MySQL 中的一个 SQL 命令,用于快速删除表中的所有数据,但不删除表本身。这个命令比DELETE更快,因为它不会记录单个行的删除操作,也不会触发任何删除触发器。 基础概念 TRUNCATE TABLE: 这个命令会移除表中的所有行,但保留表的结构、列、约束和索引。
F5执行,如图: 参考:http://blog.sqlauthority.com/2010/03/04/sql-server-rollback-truncate-command-in-transaction/ --EOF-- Author:兴百放 Web:http://xbf321.cnblogs.com/ Time:2010.3.12
// command: // SELECT * FROM USER_CONSTRAINTS WHERE TABLE_NAME = "tabnam"; 比较清楚地说明了问题,以及解决方法:可以在执行前,先禁用外键约束,执行truncate后再恢复外键约束。 4. 禁用外键约束,删除后执行恢复操作 看到外键约束名称:FK_TBL_B_A: SQL> select constraint_name, constraint_type, status fro...
Truncate – This is a command which was used in redshift to delete all the records from table. Using truncate it’s possible to delete all the records from the table. Table – This is an optional parameter that was used with truncate command in redshift. We can also execute truncate com...
SQL Delete StatementThe DELETE Statement is used to delete rows from a table.Syntax of a SQL DELETE StatementDELETE FROM table_name [WHERE condition]; table_name -- the table name which has to be updated.NOTE: The WHERE clause in the sql delete command is optional and it identifies the ...
SQL> delete from mytest; --删除表的所有数据,这个过程太长了,涉及到回滚数据的创建,库也不是我一个人在折腾 12522708 rows deleted Executed in 903.031 seconds SQL> commit; --提交变更 Commit complete Executed in 0 seconds SQL> select count(*) from mytest; --表已经空了,但没有想象中快速完成查...
EXCHANGE PARTITION. // *Action: Before performing the above operations the table, disable the // foreign key constraints in other tables. You can see what // constraints are referencing a table by issuing the following // command: // SELECT * FROM USER_CONSTRAINTS WHERE TABLE_NAME = "tab...
SQL> CREATE INDEX IDX_U2_T_LHR ON U2_T_LHR(DUMMY); Index created. SQL> SQL> GRANT SELECT,DELETE,UPDATE ON U2_T_LHR TO LHR_U1; Grant succeeded. 用户2创建存储过程并赋予用户1的执行权限: SQL> CREATE OR REPLACE PROCEDURE PRO_TRUNC_DROP_LHR(COMMAND IN VARCHAR2, ...
TRUNCATEwill not run any user-defined ON DELETE triggers that might exist for the table. EXAMPLES Truncate the table bigtable: 复制 TRUNCATE TABLE bigtable; 1. COMPATIBILITY There is noTRUNCATEcommand in the SQL standard.
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