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
REPLACEPriorityOptIntoOptTableNamePartitionNameListOptInsertValues
PriorityOpt
LOW_PRIORITYHIGH_PRIORITYDELAYED
IntoOpt
INTO
TableName
Identifier.Identifier
PartitionNameListOpt
PARTITION(Identifier,)
InsertValues
(ColumnNameListOpt)ValueSymValuesListSelectStmt(SelectStmt)UnionStmtSelectStmt)ValueSymValuesListSelectStmtUnionStmtSETColumnSetValue,ColumnSetValue

示例

CREATE TABLE t1 (id INT NOT NULL PRIMARY KEY AUTO_INCREMENT, c1 INT NOT NULL);
Query OK, 0 rows affected (0.12 sec)
INSERT INTO t1 (c1) VALUES (1), (2), (3);
Query OK, 3 rows affected (0.02 sec) Records: 3 Duplicates: 0 Warnings: 0
SELECT * FROM t1;
+----+----+ | id | c1 | +----+----+ | 1 | 1 | | 2 | 2 | | 3 | 3 | +----+----+ 3 rows in set (0.00 sec)
REPLACE INTO t1 (id, c1) VALUES(3, 99);
Query OK, 2 rows affected (0.01 sec)
SELECT * FROM t1;
+----+----+ | id | c1 | +----+----+ | 1 | 1 | | 2 | 2 | | 3 | 99 | +----+----+ 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,请尝试 TiDB 支持资源

另请参阅