左加入到獲得列的總和在第二個表

Question

如何獲得提供從表收集的Collection.Amount總和，有沒有對所有JId項目，但只適用於那些JId具有對他們的一些支付

ALTER PROCEDURE dbo.test 
AS 
select JobCard.JId, sum(cast(isnull(Collection.Amount, 0) as bigint)) as [Amount] 
from JobCard left join Collection on JobCard.JId=Collection.JId 
group by JobCard.JId, Collection.Amount 
order by JobCard.JId 

Answer 1

您GROUP BY條款改爲：

group by JobCard.JId 

Answer 2

我想你應該寫這樣的查詢，這會給你一個完美的結果。

ALTER PROCEDURE dbo.test 
AS 
    SELECT J.JId, 
      SUM(CAST(ISNULL(C.Amount, 0) AS BIGINT)) AS [Amount] 
    FROM JobCard J 
      LEFT JOIN COLLECTION C 
       ON J.JId = C.JId 
    GROUP BY 
      J.JId 
    ORDER BY 
      J.JId 

需要從group by子句中移除Collection.Amount。