使用CTE的SQL Server触发器在插入后更新另一个字段

Question

我在插入后创建了一个更新列的触发器。我遇到的问题是IsNowComplete CTE似乎没有处理多个＆＃34;选择列表＆＃34;有多个项目。我如何解释这种情况？我的触发器代码：

AFTER INSERT, UPDATE
AS
    WITH WasComplete AS 
    (
        SELECT  
            pl.IsComplete, pl.Id
        FROM    
            dbo.PickList pl
        JOIN    
            inserted i ON pl.Id = i.PickListId
    ), IsNowComplete AS 
    (
       SELECT   
           i.PickListId, 
           IsNowComplete = CASE 
                              WHEN COUNT(1) > 0 THEN 0 ELSE 1
                           END
       FROM 
           dbo.PickListContent plc
       JOIN 
           inserted i ON plc.PickListId = i.PickListId 
       WHERE    
           plc.PickListId = i.PickListId
           AND plc.QuantityPicked != plc.QuantityNeeded
       GROUP BY
           i.PickListId
    )
    UPDATE pl
    SET IsComplete = CASE 
                         WHEN ws.IsComplete = 0 AND inc.IsNowComplete = 1 
                           THEN 1
                         WHEN ws.IsComplete = 1 AND inc.IsNowComplete = 0 
                           THEN 0
                         ELSE 
                           ws.IsComplete 
                     END
    FROM dbo.PickList pl
    JOIN WasComplete ws ON pl.Id = ws.Id
    JOIN IsNowComplete inc ON ws.Id = inc.PickListId
END

Answer 1

请将isNowComplete的WHERE子句修改为

  

AND plc.QuantityPicked不存在（从dbo.PickListContent plc1中选择plc1.QuantityNeeded）

如果没有空值，您也可以使用NOT IN。

希望这有帮助。