設置變量值

Question

我確定這是簡單的，但我似乎無法弄清楚。爲什麼這個代碼不工作？

DECLARE @FirstSaturday DATETIME 
DECLARE @ENDDATE DATETIME 

SELECT @FirstSaturday = min(RED1.DATE) 
FROM REDFRIDAYDATES..TBLREDFRIDAYALLDATES RED1 
WHERE Period = 9 AND year = 2009 
SELECT CASE 
WHEN getdate() < @FirstSaturday 
THEN set @ENDDATE = getdate() 
ELSE SET @enddate = @FirstSaturday 


END 

我只是想將早期日期的值，即今天或期末的值分配給@enddate。

有人能指出我正確的方向嗎？我使用SQL 2000

Answer 1

的SELECT CASE只是沒有按任何意義，嘗試： -

DECLARE @FirstSaturday DATETIME 
DECLARE @ENDDATE DATETIME 

SELECT @FirstSaturday = min(RED1.DATE) 
FROM REDFRIDAYDATES..TBLREDFRIDAYALLDATES RED1 
WHERE Period = 9 AND year = 2009 

SELECT @ENDDATE = CASE 
WHEN getdate() < @FirstSaturday 
THEN getdate() 
ELSE @FirstSaturday 
END 

Answer 2

關鍵字 '終結' 添加到Case語句

DECLARE @FirstSaturday DATETIME 
DECLARE @ENDDATE DATETIME 
SELECT @FirstSaturday = min(RED1.DATE) 
FROM REDFRIDAYDATES..TBLREDFRIDAYALLDATES RED1 
WHERE Period = 9 
    AND year = 2009 

SELECT @ENDDATE = 
    Case 
     WHEN getdate() < @FirstSaturday 
     THEN getdate() 
     ELSE @FirstSaturday 
    End 

Answer 3

SELECT @enddate = CASE 
WHEN getdate() < @FirstSaturday THEN getdate() 
ELSE @FirstSaturday 
END 

情況下，T-SQL結束時的表情（如?:在C），而不是流量控制分支，如IF。