(1)我们When matched、When not matched by target、when not matched by source都写上了,其实是可选的,我们可以根据自己的需求只使用其中的部分。 (2)前面是Merge into Student_Target as st,其实可以增加top(n)来对特定数量的行进行操作。执行如下SQL: 1 2 3 4 5 6 7 8 9 10 11 MERGETOP(2)INTOStu...
指定根据 <merge_matched> 子句更新或删除 *target_table 中所有与 ON <merge_search_condition> 返回的行不匹配而满足其他所有搜索条件的行。 MERGE 语句最多可以有两个 WHEN NOT MATCHED BY SOURCE 子句。 如果指定了两个子句,第一个子句必须随附 AND <clause_search_condition> 子句。 对于任何给定行,...
你使用下列 MERGE 语句更新、插入和删除CurrentStudents 表中的行。 MERGE TOP (3) CurrentStudents AS T USING NewYearRoster AS S ON S.LastName = T.LastName AND S.FirstName = T.FirstName WHEN MATCHED AND NOT (T.Age = S.Age OR T.Address = S.Address) THEN ...
[ INTO ] <target_table> [ WITH ( <merge_hint> ) ] [ [ AS ] table_alias ] USING ON <merge_search_condition> [ WHEN MATCHED [ AND <clause_search_condition> ] THEN <merge_matched> ] [ ...n ] [ WHEN NOT MATCHED [ BY TARGET ] [ AND <clause_search_condition> ] THEN <merge...
MERGE target_table USING raw_table ON... WHEN MATCHED THEN // do something WHEN NOT MATCHED THEN // do something ; 注意,必须以分号来结束MERGE语句。示例代码如下: 代码语言:txt AI代码解释 MERGE INTO dbo.Customers AS CT USING dbo.CustomersStage AS CS ...
MERGE MERGE是标准的SQL语句,T-SQL对其进行了一定的扩展。MERGE语句实现的功能通常可以转换为几个其他DML语句(INSERT、UPDATE、DELETE)的组合,使用MERGE语句可以使代码更为简洁。 MERGEtarget_tableUSINGraw_table ON...WHENMATCHEDTHEN//do somethingWHENNOTMATCHEDTHEN//do something ...
MERGE INTO TargetTable AS TGT USING SourceTable AS SRC ON TGT.Col1 = SRC.Col1 WHEN MATCHED AND SRC.Col2 IS NOT NULL THEN UPDATE SET TGT.Col2 = SRC.Col2 WHEN NOT MATCHED THEN INSERT (Col1, Col2) VALUES (SRC.Col1, SRC.Col2) WHEN NOT MATCHED BY SOU...
[ WHEN [TARGET] NOT MATCHED [ AND <search_condition> ] THEN <merge_not_matched> ] [ WHEN SOURCE NOT MATCHED [ AND <search_condition> ] THEN <merge_ matched> ] [ OPTION ( <query_hint> [ ,...n ] ) ] ; <merge_hint>::
THEN <merge_matched> ] [ WHEN [TARGET] NOT MATCHED [ AND <search_condition> ] THEN <merge_not_matched> ] [ WHEN SOURCE NOT MATCHED [ AND <search_condition> ] THEN <merge_ matched> ] [ OPTION ( <query_hint> [ ,...n ] ) ] ; <merge_hint>...
'TRY_CONVERT' is not a recognized built-in function name 'VARCHAR' is not a recognized built-in function name. 'WHEN MATCHED' cannot appear more than once in a 'UPDATE' clause of a MERGE statement. "EXECUTE AT" with Dynamic Linked Server Name "explicit value must be spec...