TRUNCATE

    语句以非事务方式从表中删除所有数据。可认为 TRUNCATE 语句同 DROP TABLE + CREATE TABLE 组合在语义上相同,定义与 DROP TABLE 语句相同。

    TRUNCATE TABLE tableNameTRUNCATE tableName 均为有效语法。

    OptTable:

    TableName:

    TableName

    1. Query OK, 0 rows affected (0.11 sec)
    1. INSERT INTO t1 VALUES (1),(2),(3),(4),(5);
    1. Records: 5 Duplicates: 0 Warnings: 0
    1. +---+
    2. +---+
    3. | 1 |
    4. | 2 |
    5. | 3 |
    6. | 4 |
    7. +---+
    8. 5 rows in set (0.00 sec)
    1. TRUNCATE t1;
      1. Empty set (0.00 sec)
      1. INSERT INTO t1 VALUES (1),(2),(3),(4),(5);
      1. Query OK, 5 rows affected (0.01 sec)
      2. Records: 5 Duplicates: 0 Warnings: 0