Summary: in this tutorial, you will learn how to use the Oracle MERGE statement to perform an update or insert data based on a specified condition. Introduction to the Oracle MERGE statement The Oracle MERGE statement selects data from one or more source tables and updates or inserts it int...
The five DML statements available in Oracle are INSERT, UPDATE, DELETE, MERGE and TRUNCATE. The first three are somewhatexplanatory. MERGE may not be. A MERGE statement will take one row source and merge it into another. And what that means is that the source row set may have rows that ...
它可以让你避免多个INSERT、UPDATE和DELETE DML语句。 MERGEis a deterministic statement. That is, you cannot update the same row of the target table multiple times in the sameMERGEstatement. 合并是一个决定性的声明。也就是说,你不能更新相同的目标表行多次在同一MERGE语句。 Note: Oracle Database does...
I received "ORA-02290: check constraint (PRODUCTION.PROJ_PH_PHASE_NUMBER_CK) violated" after running the following merge statement: {code } merge into project_phase target using (select distinct project_id, phase_cd from staging_iris where project_id is not nu...
Thus when a row is updated inproducts, Oracle checks the delete conditionD.PROD_STATUS = "OBSOLETE", and deletes the row if the condition yields true. TheDELETEoperation is not as same as that of a completeDELETEstatement. Only the rows from the destination of theMERGEcan be deleted. The...
Thus when a row is updated inproducts, Oracle checks the delete conditionD.PROD_STATUS = "OBSOLETE", and deletes the row if the condition yields true. TheDELETEoperation is not as same as that of a completeDELETEstatement. Only the rows from the destination of theMERGEcan be deleted. The...
在Oracle中执行Merge Into操作时运行时间较长可能是由于以下原因: 1. 数据量较大:如果合并的表中包含大量数据,执行Merge Into操作可能会花费较长的时间。这可能需要优化查询语句...
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该如何使用MERGE,我们以Customers表和Orders表为例。数据如...
Oracle中的 Merge函数(批量更新删除) Oracle中的 Merge函数 (批量更新 /删除 ) 摘至网上的几个例子 一、 *** Merger into是oracle从9i开始增加的一个语句,从merge的字面上的意思:合并,兼并不难理解 merge在oracle中的含义,merge在oracle所起的作用是:如果你从以组值中有选择的更新和插 入到到一张表,具体...
...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...