Question

如果所有Collection.Amount的条目都没有，只有那些JId有一些付款的条目

，如何从表格集中获取JId的总和

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

我认为你应该像这样编写你的查询，这会给你完美的结果。

    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

需要从group by子句中删除Collection.Amount。

Answer 2

将您的GROUP BY条款更改为：

group by JobCard.JId

left join以获取第二个表

2 个答案: