Use of MySQL truncate table statement

The Truncate table statement is used to delete/truncate all data in the table.

This is the same as delete, which means deleting all table data, but has faster performance.
Similar to executing the drop table and create table statements

Executing Code

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)

What permissions does truncate need?

The execution of truncate is drop first and then create, so truncate includes drop and create, which is a compound action. You don't need to grant create permission, so you only need to grant drop permission.

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