Truncate table語(yǔ)句用來(lái)刪除/截?cái)啾砝锏乃袛?shù)據(jù)

和delete刪除所有表數(shù)據(jù)在邏輯上含義相同，但性能更快 類似執(zhí)行了drop table和create table兩個(gè)語(yǔ)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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