使用別名的SQL查詢

Question

我試圖在MS SQL服務器中寫下SQL查詢，但它在處顯示語法錯誤，其中。

Select ECUID,ECUNAME 
FROM 
(SELECT  [ECU-ID] as ECUID, [ECU-NAME]as ECUNAME FROM   TBL_ECU_MAST) 
WHERE ECUID = 147; 

請幫我解決這個問題。

Answer 1

由於@Gordon建議你必須給所使用子查詢的別名SQL語句

SELECT ECUID,ECUNAME 
FROM 
    (SELECT [ECU-ID] AS ECUID, [ECU-NAME] AS ECUNAME FROM TBL_ECU_MAST) T 
WHERE T.ECUID = 147; 

內10

希望這有助於！

Answer 2

只要給你的表達一個別名;

Select aliasHere.ECUID, aliasHere.ECUNAME 
FROM 
(SELECT  
    [ECU-ID] as ECUID, [ECU-NAME]as ECUNAME 
    FROM   TBL_ECU_MAST) aliasHere 
WHERE aliasHere.ECUID = 147; 

顯然使用更具描述性的名稱...

Answer 3

給別名爲所有子查詢：

SELECT A.ECUID, A.ECUNAME 
FROM 
(
    SELECT [ECU-ID] as ECUID, [ECU-NAME]as ECUNAME 
    FROM TBL_ECU_MAST 
) A 
WHERE A.ECUID = 147; 

Answer 4

您可以使用下面的代碼

;with t as 
(
SELECT [ECU-ID] AS ECUID, [ECU-NAME] AS ECUNAME FROM TBL_ECU_MAST 
) 
SELECT ECUID,ECUNAME 
FROM t WHERE ECUID = 147