MySQL truncate table語句的使用
Truncate table語句用來刪除/截斷表里的所有數據
和delete刪除所有表數據在邏輯上含義相同，但性能更快 類似執行了drop table和create table兩個語句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)
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