Question

我曾尝试在MS SQL服务器中编写下面的SQL查询，但它在 WHERE 附近显示语法错误。

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

请帮我解决这个问题。

Answer 1

只需给你的表达一个别名;

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

显然使用更具描述性的别名......

Answer 2

您可以使用其他方式。例如下面的代码

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

Answer 3

正如@Gordon建议你必须为SQL语句中使用的SubQuery提供别名

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

希望这会有所帮助!!

Answer 4

为所有子查询指定别名：

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

使用别名的SQL查询

4 个答案: