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这个目前的工作,但我想更改更新声明,以包括在它下面的插入的行为,是否可行?如何正确地将这2个查询合并为一个更新?
UPDATE cas
SET [Locked] = CASE WHEN cas.Locked <> @TargetState AND cas.LastChanged = filter.SourceDateTime THEN @TargetState ELSE cas.[Locked] end,
OUTPUT inserted.Id, inserted.Locked, CASE WHEN inserted.Locked = @TargetState AND
inserted.LastChanged = filter.SourceDateTime THEN 1
WHEN inserted.LastChanged <> filter.SourceDateTime THEN -1 -- out of sync
WHEN deleted.Locked = @TargetState THEN -2 -- was not in a good state
ELSE 0 END --generic failure
INTO @OUTPUT
FROM dbo.Target cas WITH(READPAST, UPDLOCK, ROWLOCK) INNER JOIN @table filter ON cas.Id = filter.Id
INSERT INTO @OUTPUT
SELECT filter.id, NULL, when cas.id is not null -3 -- row was/is locked
else -4 end --not found
FROM @table filter left join dbo.target cas with(nolock) on filter.id = cas.id
WHERE NOT EXISTS (SELECT 1 FROM @OUTPUT result WHERE filter.id = result.UpdatedId)
是的,这是可能的。它被称为['MERGE'](https://msdn.microsoft.com/en-us/library/bb510625.aspx)。 – lad2025
我不明白@Fredou如何通过MERGE语句获得他想要的内容。 –
@ lad2025我目前正在寻找合并,我还不确定如何做到这一点与表提示和皮卡行被锁定,没有找到,目前我只做一个通用检查 – Fredou