在 SQL Server 中使用 MERGE 命令从源中删除

Question

我在 @temptable 中有一个临时表数据，我需要将此数据与表名 LU_BCOMS_UsersRepFamilies 进行比较

通过使用此 @temptable 数据，我需要根据 where 条件将主表 LU_BCOMS_UsersRepFamilies 替换为以下列

1) RepFamily_RepFamilyId 
2) Users_UserId

我的查询如下：

declare @tempTable 
Table(RepFamily_RepFamilyId int,Users_UserId varchar(500),CreatedDate varchar(500),CreatedBy varchar(500))
insert into @tempTable values('676','MV10310','2014-05-20 13:30:29.000','MV10310')

MERGE INTO LU_BCOMS_UsersRepFamilies AS target
USING @tempTable AS source
    ON target.RepFamily_RepFamilyId = source.RepFamily_RepFamilyId
    AND target.Users_UserId = source.Users_UserId
WHEN MATCHED THEN 
    UPDATE SET 
    target.RepFamily_RepFamilyId = source.RepFamily_RepFamilyId,
    target.Users_UserId = source.Users_UserId,
    target.CreatedDate = source.CreatedDate,
    target.CreatedBy = source.CreatedBy
WHEN NOT MATCHED BY TARGET THEN
    INSERT (RepFamily_RepFamilyId, Users_UserId, CreatedDate,CreatedBy)
    VALUES (source.RepFamily_RepFamilyId, source.Users_UserId, source.CreatedDate,source.CreatedBy)
WHEN NOT MATCHED BY SOURCE  THEN
    DELETE  WHERE target.RepFamily_RepFamilyId = source.RepFamily_RepFamilyId and target.Users_UserId = source.Users_UserId;

执行我的查询后，我收到以下错误

错误： 关键字“WHERE”附近的语法不正确。

你能根据上面指定的要求修改我的查询吗

Example : 

    RepFamily_RepFamilyId  Users_UserId  CreatedDate  CreatedBy
    600                         MV10310     date           ravi
    601                         MV10310     date           ravi
    602                         KV110       date           suma
    603                         GV122       date           rajesh

in my temp table I have 

    insert into @tempTable values('600','MV10310','date','ravi')

after merging my master table show look like below :

     RepFamily_RepFamilyId  Users_UserId  CreatedDate  CreatedBy
        600                         MV10310     date           ravi   
        602                         KV110       date           suma
        603                         GV122       date           rajesh

Answer 1

您的WHERE 进入WHEN NOT MATCHED 行...

例子：

WHEN NOT MATCHED BY SOURCE AND SOMEVALUE=5 THEN
DELETE;

但是....在您上面的代码中，您的WHERE 是：

WHERE target.RepFamily_RepFamilyId = source.RepFamily_RepFamilyId and target.Users_UserId = source.Users_UserId

与您的USING-ON 相同：

ON target.RepFamily_RepFamilyId = source.RepFamily_RepFamilyId
    AND target.Users_UserId = source.Users_UserId

因此，如果它是 NOT MATCHED BY SOURCE（从源代码中丢失），您的 where 条件将永远不会满足，也不会删除任何内容...

我相信你只是想删除 WHERE 如下：

MERGE INTO LU_BCOMS_UsersRepFamilies AS target
USING @tempTable AS source
    ON target.RepFamily_RepFamilyId = source.RepFamily_RepFamilyId
    AND target.Users_UserId = source.Users_UserId
WHEN MATCHED THEN 
    UPDATE SET 
    target.RepFamily_RepFamilyId = source.RepFamily_RepFamilyId,
    target.Users_UserId = source.Users_UserId,
    target.CreatedDate = source.CreatedDate,
    target.CreatedBy = source.CreatedBy
WHEN NOT MATCHED BY TARGET THEN
    INSERT (RepFamily_RepFamilyId, Users_UserId, CreatedDate,CreatedBy)
    VALUES (source.RepFamily_RepFamilyId, source.Users_UserId, source.CreatedDate,source.CreatedBy)
WHEN NOT MATCHED BY SOURCE AND target.Users_UserId IN (SELECT DISTINCT Users_UserId FROM @tempTable) THEN 
    DELETE;

Answer 2

这是答案..

MERGE INTO LU_BCOMS_UsersRepFamilies AS target
USING @tempTable AS source
    ON target.RepFamily_RepFamilyId = source.RepFamily_RepFamilyId
    AND target.Users_UserId = source.Users_UserId
WHEN MATCHED THEN 
    UPDATE SET 
    target.RepFamily_RepFamilyId = source.RepFamily_RepFamilyId,
    target.Users_UserId = source.Users_UserId,
    target.CreatedDate = source.CreatedDate,
    target.CreatedBy = source.CreatedBy
WHEN NOT MATCHED BY TARGET THEN
    INSERT (RepFamily_RepFamilyId, Users_UserId, CreatedDate,CreatedBy)
    VALUES (source.RepFamily_RepFamilyId, source.Users_UserId, source.CreatedDate,source.CreatedBy)
 WHEN NOT MATCHED BY SOURCE AND  target.Users_UserId = (select top 1 (A.Users_UserId) from @tempTable as A) Then 
 DELETE ; 

Answer 3

尝试更改您的上次删除语句，

DELETE  source WHERE target.RepFamily_RepFamilyId = source.RepFamily_RepFamilyId and target.Users_UserId = source.Users_UserId;