COUNT從PHP導致db2中出現錯誤

Question

當我運行此查詢時，出現以下錯誤：

Column MANUFACTURER or expression in SELECT list not valid.

如果刪除COUNT函數，查詢運行正常。

有任何想法嗎？

（此查詢有點兒模擬，因此可能不太合理）

SELECT
  MANUFACTURER
, PART_NUMBER
, COUNT(1) AS CNT
FROM 
( SELECT
    AWPART AS PART_NUMBER  
  , MANF AS MANUFACTURER       
  FROM STKMP                        
    INNER JOIN PRICING AS P         
      ON AWPART = P.JCPART  
      AND R.CODE = 1        
    WHERE  PART_NUMBER LIKE '%A2%') AS T 

如下修改最后一行會產生相同的效果。

WHERE  PART_NUMBER LIKE '%A2%') AS T  GROUP BY MANUFACTURER              

Answer 1

通常， COUNT()僅在您具有GROUP BY子句時才有意義。 也許您打算將其添加到末尾（在AS T ？）：

GROUP BY MANUFACTURER, PART_NUMBER;