If the condition is not satisfied, then the given source record is processed without performing the appropriate default operation. In one aspect, the UPDATE clause of the MERGE statement is extended to include a conditional DELETE clause. Hence, records are deleted as appropriate based on a ...
-- MERGE statement with join conditions that produce unexpected results. USE tempdb; GO BEGIN TRAN; MERGE Target AS T USING Source AS S ON (T.EmployeeID = S.EmployeeID AND T.EmployeeName LIKE 'S%' AND S.EmployeeName LIKE 'S%' ) WHEN NOT MATCHED BY TARGET THEN INSERT(EmployeeID, Emp...
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...
8. 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....
如果有两个 WHEN MATCHED 子句,一个必须指定 UPDATE 操作,另一个必须指定 DELETE 操作。 如果在<merge_matched>子句中指定了 UPDATE,并且根据<merge_search_condition>中有多行与target_table中的一行匹配, SQL Server 便会返回错误。 MERGE 语句无法多次更新同一行,也无法更新和删除同一行。 WHEN NOT MATCHED...
2.1.2.52 F314, MERGE statement with DELETE branch 项目 2024/10/31 V0088 The specification states the following: Subclause 14.12, "<merge statement>": <merge when matched clause> ::= WHEN MATCHED [ AND <search condition> ] THEN <merge update or delete specification> <merge update o...
Because the additional search condition is not required to determine source and target matching, the insert and delete actions are applied to all input rows. In effect, the filtering condition EmployeeName LIKE 'S%' is ignored. When the statement is run, the output of the inserted and deleted...
如果有两个 WHEN MATCHED 子句,一个必须指定 UPDATE 操作,另一个必须指定 DELETE 操作。 如果在<merge_matched>子句中指定了 UPDATE,并且根据<merge_search_condition>中有多行与target_table中的一行匹配, SQL Server 便会返回错误。 MERGE 语句无法多次更新同一行,也无法更新和删除同一行。 WHEN NOT MATCHED...
{ throw new SparkException( "The ON search condition of the MERGE statement matched a single row from " + "the target table with multiple rows of the source table. This could result " + "in the target row being operated on more than once with an update or delete " + "operation and ...
如果有两个 WHEN MATCHED 子句,那么其中的一个必须指定 UPDATE 操作,而另一个必须指定 DELETE 操作。如果在 <merge_matched> 子句中指定了 UPDATE,并且根据 <merge_search_condition>, 中的多个行与 target_table 中的某一行匹配,则 SQL Server 将返回错误。MERGE 语句无法多次更新同一行,也无法更新和删除同一行...