title: REPLACE summary: TiDB 数据库中 REPLACE 的使用概况。

REPLACE

从语义上看,REPLACE 语句是 DELETE 语句和 INSERT 语句的结合,可用于简化应用程序代码。

语法图

ReplaceIntoStmt:

ReplaceIntoStmt

PriorityOpt:

PriorityOpt

IntoOpt:

IntoOpt

TableName:

TableName

PartitionNameListOpt:

PartitionNameListOpt

InsertValues:

InsertValues

示例

  1. CREATE TABLE t1 (id INT NOT NULL PRIMARY KEY AUTO_INCREMENT, c1 INT NOT NULL);
  1. Query OK, 0 rows affected (0.12 sec)
  1. INSERT INTO t1 (c1) VALUES (1), (2), (3);
  1. Query OK, 3 rows affected (0.02 sec)
  2. Records: 3 Duplicates: 0 Warnings: 0
  1. SELECT * FROM t1;
  1. +----+----+
  2. | id | c1 |
  3. +----+----+
  4. | 1 | 1 |
  5. | 2 | 2 |
  6. | 3 | 3 |
  7. +----+----+
  8. 3 rows in set (0.00 sec)
  1. REPLACE INTO t1 (id, c1) VALUES(3, 99);
  1. Query OK, 2 rows affected (0.01 sec)
  1. SELECT * FROM t1;
  1. +----+----+
  2. | id | c1 |
  3. +----+----+
  4. | 1 | 1 |
  5. | 2 | 2 |
  6. | 3 | 99 |
  7. +----+----+
  8. 3 rows in set (0.00 sec)

MySQL 兼容性

REPLACE 语句与 MySQL 完全兼容。如发现任何兼容性差异,请在 GitHub 上提交 issue

另请参阅