MySQL|MySQL truncate table语句的使用 MySQLtruncatetable语句的使用

【MySQL|MySQL truncate table语句的使用】Truncate table语句用来删除/截断表里的所有数据

和delete删除所有表数据在逻辑上含义相同，但性能更快
类似执行了drop table和create table两个语句

执行代码

mysql> select * from students_bak; +-----+----------+--------+---------+| sid | sname | gender | dept_id |+-----+----------+--------+---------+| 101 | zhangsan | male |10 || 1 | aa| 1|1 |+-----+----------+--------+---------+2 rows in set (0.00 sec)mysql> truncate table students_bak; Query OK, 0 rows affected (0.16 sec)mysql> select * from students_bak; Empty set (0.00 sec)mysql> set autocommit=off; Query OK, 0 rows affected (0.01 sec)mysql> select * from students3; +-----+-------+--------+---------+--------+| sid | sname | gender | dept_id | sname2 |+-----+-------+--------+---------+--------+| 100 | NULL | 1|1 | NULL |+-----+-------+--------+---------+--------+1 row in set (0.01 sec)mysql> truncate table students3; Query OK, 0 rows affected (0.06 sec)mysql> rollback; Query OK, 0 rows affected (0.00 sec)mysql> select * from students3; Empty set (0.00 sec)mysql> delete from students; Query OK, 5 rows affected (0.00 sec)mysql> select * from students; Empty set (0.00 sec)mysql> rollback; Query OK, 0 rows affected (0.07 sec)mysql> select * from students; +-----+-------+--------+---------+| sid | sname | gender | dept_id |+-----+-------+--------+---------+| 1 | aa | 3|1 || 4 | cc | 3|1 || 5 | dd | 1|2 || 6 | aac | 1|1 || 10 | a| 1|1 |+-----+-------+--------+---------+5 rows in set (0.00 sec)

truncate需要什么权限
truncate的执行是先drop后create的，所以truncate包含drop和create，是一个复合的动作，对于create不用赋予，所以只需要赋予drop权限就可以了
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