无法在子查询上执行聚合函数

Question

有人可以帮我解决这个问题吗？

SELECT p.OwnerName, SUM(ru.MonthlyRent) AS PotentinalRent,  SUM(
    (SELECT COUNT(t.ID) * ru.MonthlyRent FROM tblTenant t 
      WHERE t.UnitID = ru.ID)
    ) AS ExpectedRent
 FROM tblRentalUnit ru
LEFT JOIN tblProperty p ON p.ID = ru.PropertyID
GROUP BY p.OwnerName

我遇到了第二笔钱的问题,它不会让我这样做.显然,SUM不会对子查询起作用,但是我需要计算预期的租金(如果有租户分配给RentalUnit的id,则为MonthlyRent,其中0不是).我怎样才能做到这一点？

Answer 1

SELECT  p.OwnerName, SUM(ru.MonthlyRent) AS PotentialRent, SUM(cnt) AS ExpectedRent
FROM    tblRentalUnit ru
LEFT JOIN
        tblProperty p
ON      p.ID = ru.PropertyID
OUTER APPLY
        (
        SELECT  COUNT(t.id) * ru.MonthlyRent AS cnt
        FROM    tblTenant t
        WHERE   t.UnitID = ru.ID
        ) td
GROUP BY p.OwnerName

这是一个要检查的测试脚本:

WITH    tblRentalUnit AS
        (
        SELECT  1 AS id, 100 AS MonthlyRent, 1 AS PropertyID
        UNION ALL
        SELECT  2 AS id, 300 AS MonthlyRent, 2 AS PropertyID
        ),
        tblProperty AS
        (
        SELECT  1 AS id, 'Owner 1' AS OwnerName
        UNION ALL
        SELECT  2 AS id, 'Owner 2' AS OwnerName
        ),
        tblTenant AS
        (
        SELECT  1 AS id, 1 AS UnitID
        UNION ALL
        SELECT  2 AS id, 1 AS UnitID
        )
SELECT  p.OwnerName, SUM(ru.MonthlyRent) AS PotentialRent, SUM(cnt) AS ExpectedRent
FROM    tblRentalUnit ru
LEFT JOIN
        tblProperty p
ON      p.ID = ru.PropertyID
OUTER APPLY
        (
        SELECT  COUNT(t.id) * ru.MonthlyRent AS cnt
        FROM    tblTenant t
        WHERE   t.UnitID = ru.ID
        ) td
GROUP BY p.OwnerName