MSSQL select where sum sum than 0

Question

我需要返回結果，其中amount_left大於0。我試過這個，但是這給出了錯誤的結果。

SELECT DISTINCT [item no_], 
      (SELECT Sum(quantity) 
      FROM dbo.[auto kada sia$item ledger entry] 
      WHERE [item no_] = a.[item no_]) AS 'amount_left' 
FROM dbo.[auto kada sia$item ledger entry] AS a 
ORDER BY a.[item no_] 

如何才能達到要求的效果？

Answer 1

SELECT [item no_], SUM(quantity) AS 'amount_left' 
FROM dbo.[auto kada sia$item ledger entry] 
GROUP BY [item no_] 
HAVING SUM(quantity) > 0 
ORDER BY [item no_];