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MySQL truncate table语句的使用

作者:丁海龙

这篇文章主要介绍了MySQL truncate table语句的使用,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学习吧

Truncate table语句用来删除/截断表里的所有数据

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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