SQL触发器IF语句

Question

我已经检测到特定的列的值时创建了以下触发：

ALTER TRIGGER [dbo].[trCompletedDate] ON [dbo].[Record] 
FOR UPDATE AS BEGIN 
IF(UPDATE(Completed)) 

UPDATE Record SET Completed_Date=DATEADD(hh, 7, GETDATE()) 
FROM Record 
INNER JOIN Inserted ON Record.[ID]= Inserted.[ID] 
WHERE Record.Completed = 1 
END 

，工作正常，但我想补充一个IF语句Completed_Date的值更改为Record.Completed = 0时的另一个值。

我只是不确定语法如何。

Answer 1

UPDATE Record SET Completed_Date = 
CASE WHEN Record.Completed = 1 THEN 
    DATEADD(hh, 7, GETDATE()) 
ELSE 
    --Somethin else 
END 
FROM Record 
INNER JOIN Inserted ON Record.[ID]= Inserted.[ID] 

Answer 2

您可以使用CASE声明：

UPDATE Record 
SET Completed_Date = 
    CASE Record.Completed WHEN 1 THEN DATEADD(hh, 7, GETDATE()) 
          WHEN 0 THEN SOMETHINGELSE END 
FROM Record 
INNER JOIN Inserted ON Record.[ID]= Inserted.[ID] 
WHERE Record.Completed IN (0,1); 

Answer 3

我相信这是：

ALTER TRIGGER [dbo].[trCompletedDate] ON [dbo].[Record] 
FOR UPDATE AS BEGIN 
IF(UPDATE(Completed)) 

UPDATE Record SET 
    Completed_Date=if Record.Completed=0 then <othervalue> 
        else DATEADD(hh, 7, GETDATE()) endif 
FROM Record 
INNER JOIN Inserted ON Record.[ID]= Inserted.[ID] 
WHERE Record.Completed = 1 
END 

Answer 4

在这里你去：

ALTER TRIGGER [dbo].[trCompletedDate] ON [dbo].[Record] 
FOR UPDATE AS BEGIN 
IF(UPDATE(Completed)) 

UPDATE Record SET Completed_Date= 
    CASE Record.Completed 
     WHEN 1 THEN DATEADD(hh, 7, GETDATE()) 
     WHEN 0 THEN GETDATE() 
    END 
FROM Record 
INNER JOIN Inserted ON Record.[ID]= Inserted.[ID] 
END