SQL查询使用Sum（）连接两个查询

我知道这对sql人员来说很简单，但我正在尝试将两个简单的查询组合成一个查询。从代码中可以明显看出job.ActiveJob.ID=job.EstimateTbl.ID\u job

我正在尝试获取：id、JobName、sum（itemAmount）

谢谢你的帮助

SELECT a.id, a.JobName
FROM job.ActiveJobsTbl AS a
WHERE a.ID = '100' 

SELECT SUM(itemAmount)
FROM job.EstimateTbl
WHERE ID_Job = '100'

---

您可以

通过E.ID\u Job=A.ID上的
连接
表，并使用
分组方式

SELECT A.id, A.JobName, SUM(E.itemAmount) AS Amount 
FROM job.ActiveJobsTbl AS A
INNER JOIN job.EstimateTbl E ON E.ID_Job = A.ID 
WHERE A.ID = '100'  
GROUP BY A.id, A.JobName;

您可以使用
APPLY
：

select a.id, a.JobName, t.itemAmount 
from job.ActiveJobsTbl AS a OUTER APPLY
     (SELECT SUM(t.itemAmount) AS itemAmount
      FROM job.EstimateTbl AS t
      WHERE t.ID_Job = a.ID
     ) t
WHERE a.ID = 100; 

试试这个：

SELECT A.id, A.JobName, SUM(E.itemAmount) AS Amount 
FROM job.ActiveJobsTbl AS A
INNER JOIN job.EstimateTbl E ON E.ID_Job = A.ID 
WHERE A.ID = '100'
GROUP BY A.id, A.JobName;

使用
左连接

SELECT a.id, a.JobName,EstimateTbl.itemAmount
FROM job.ActiveJobsTbl AS a
left join
( 
    SELECT SUM(itemAmount) itemAmount,ID_Job
    FROM job.EstimateTbl
    group by ID_Job
) EstimateTbl on  EstimateTbl.ID_Job = a.ID
WHERE a.ID = '100' 

您的预期产量是多少？谢谢！所有答案都有效，但这与我的想象最接近。我非常接近，但没有想到将“E”放在SUM（）中。