TRUNCATE

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。

语法图

TruncateTableStmt:

TruncateTableStmt

OptTable:

OptTable

TableName:

TableName

示例

CREATE TABLE t1 (a INT NOT NULL PRIMARY KEY);
Query OK, 0 rows affected (0.11 sec)
INSERT INTO t1 VALUES (1),(2),(3),(4),(5);
Query OK, 5 rows affected (0.01 sec)
Records: 5  Duplicates: 0  Warnings: 0
SELECT * FROM t1;
+---+
| a |
+---+
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
+---+
5 rows in set (0.00 sec)
TRUNCATE t1;
Query OK, 0 rows affected (0.11 sec)
SELECT * FROM t1;
Empty set (0.00 sec)
INSERT INTO t1 VALUES (1),(2),(3),(4),(5);
Query OK, 5 rows affected (0.01 sec)
Records: 5  Duplicates: 0  Warnings: 0
TRUNCATE TABLE t1;
Query OK, 0 rows affected (0.11 sec)

MySQL 兼容性

TRUNCATE 语句与 MySQL 完全兼容。如有任何兼容性差异,请在 GitHub 上提交 issue

另请参阅