Using the MERGE statement in SQL gives you better flexibility in customizing your complex SQL scripts and also enhances the readability of your scripts. The MERGE statement basically modifies an existing table
FL 500The MERGE statement updates a target (a table or view) using data from a source (the result of a table reference or the specified input data). Rows in the target that match the input data can be deleted or updated as specified, and rows that do not
在MERGE NOT MATCHED 操作中,只允许执行 INSERT 语句。 一个MERGE语句中出现的MATCHED操作,只能出现一次 UPDATE 或者 DELETE 语句,否则就会出现下面的错误:An action of type 'WHEN MATCHED' cannot appear more than once in a 'UPDATE' clause of a MERGE statement. MERGE示例 下...
在MERGE NOT MATCHED 操作中,只允许执行 INSERT 语句。 一个MERGE语句中出现的MATCHED操作,只能出现一次 UPDATE 或者 DELETE 语句,否则就会出现下面的错误: An action of type 'WHEN MATCHED' cannot appear more than once in a 'UPDATE' clause of a MERGE statement. MERGE示例 下面我们通过一个示例来介绍一下...
...比如,这样的一句SQL语句SELECT 1 FROM dual WHERE a = bSELECT 1 FROM dual WHERE a = bJSqlParser可以将其解析为如下对象结构 SQL...来访问这句SQL语句中的各个要素:Statement statement = CCJSqlParserUtil.parse(sqlStr);if (statement instanceof Select...,包括:OracleMS SQL Server and Sybase...
一个MERGE语句中出现的MATCHED操作,只能出现一次 UPDATE 或者 DELETE 语句,否则就会出现下面的错误: An action of type 'WHEN MATCHED' cannot appear more than once in a 'UPDATE' clause of a MERGE statement. MERGE示例 下面我们通过一个示例来介绍一下该如何使用MERGE,我们以Customers表和Orders表为例。数据...
参考Oracle 的SQL Reference,大家可以看到Merge Statement的语法如下: MERGE [hint] INTO [schema .] table [t_alias] USING [schema .] { table | view | subquery } [t_alias] ON ( condition ) WHEN MATCHED THEN merge_update_clause WHEN NOT MATCHED THEN merge_insert_clause; ...
SQL database in Microsoft Fabric The MERGE statement runs insert, update, or delete operations on a target table from the results of a join with a source table. For example, synchronize two tables by inserting, updating, or deleting rows in one table based on differences found in the other...
PREPAREstmtFROM@merge_statement;EXECUTEstmt;DEALLOCATEPREPAREstmt; 1. 2. 3. 以上是MySQL实现Merge语句的完整步骤和代码示例。你可以根据自己的实际需求,修改相应的表名、合并条件、更新逻辑和插入逻辑。 总结 在本文中,我们介绍了如何使用MySQL实现Merge语句。通过指定目标表和源表,定义合并条件,指定更新逻辑和插入逻...
在SQL Server 2008 中,您可以使用 MERGE 语句在一条语句中执行插入、更新或删除操作。MERGE 语句允许您将数据源与目标表或视图联接,然后根据该联接的结果对目标执行多项操作。例如,您可以使用 MERGE 语句执行以下操作: 有条件地在目标表中插入或更新行。