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 tableName 和 TRUNCATE tableName 均为有效语法。

语法图

TruncateTableStmt:

OptTable:

TableName:

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)

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。