RENAME TABLE
此语句用于重命名现有的表和视图，支持一次重命名多个表以及跨数据库重命名。
语法概要
- RenameTableStmt
- TableToTable
RenameTableStmt ::=
'RENAME' 'TABLE' TableToTable ( ',' TableToTable )*
TableToTable ::=
TableName 'TO' TableName
示例
CREATE TABLE t1 (a int);
Query OK, 0 rows affected (0.12 sec)
SHOW TABLES;
+----------------+
| Tables_in_test |
+----------------+
| t1 |
+----------------+
1 row in set (0.00 sec)
RENAME TABLE t1 TO t2;
Query OK, 0 rows affected (0.08 sec)
SHOW TABLES;
+----------------+
| Tables_in_test |
+----------------+
| t2 |
+----------------+
1 row in set (0.00 sec)
以下示例演示如何在跨数据库的情况下重命名多个表，假设数据库 db1、db2、db3 和 db4 已经存在，且表 db1.t1 和 db3.t3 已存在：
RENAME TABLE db1.t1 To db2.t2, db3.t3 To db4.t4;
Query OK, 0 rows affected (0.08 sec)
USE db1; SHOW TABLES;
Database changed
Empty set (0.00 sec)
USE db2; SHOW TABLES;
Database changed
+---------------+
| Tables_in_db2 |
+---------------+
| t2 |
+---------------+
1 row in set (0.00 sec)
USE db3; SHOW TABLES;
Database changed
Empty set (0.00 sec)
USE db4; SHOW TABLES;
Database changed
+---------------+
| Tables_in_db4 |
+---------------+
| t4 |
+---------------+
1 row in set (0.00 sec)
原子重命名可以用来交换表，确保在操作过程中表不会出现不存在的瞬间。
CREATE TABLE t1(id int PRIMARY KEY);
Query OK, 0 rows affected (0.04 sec)
CREATE TABLE t1_new(id int PRIMARY KEY, n CHAR(0));
Query OK, 0 rows affected (0.04 sec)
RENAME TABLE t1 TO t1_old, t1_new TO t1;
Query OK, 0 rows affected (0.07 sec)
SHOW CREATE TABLE t1\G
*************************** 1. row ***************************
Table: t1
Create Table: CREATE TABLE `t1` (
`id` int NOT NULL,
`n` char(0) DEFAULT NULL,
PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
1 row in set (0.00 sec)
MySQL 兼容性
TiDB 中的 RENAME TABLE 语句与 MySQL 完全兼容。如果你发现任何兼容性差异，请 报告一个 bug。