如何在已经存在数学运算的地方编写SQL连接

问题描述

select SUM([DC_Bill]) FROM [Bill_Details] where [CustomerID]=''1''


select * from Customer_Details where [CustomerID]=''1''

How do i join these two?

推荐答案

SELECT CD.*,BD.DC_BILL
FROM CUSTOMER_DETAILS CD
    LEFT JOIN (SELECT CUSTOMERID,SUM([DC_BILL]) AS [DC_BILL] FROM BILL_DETAILS GROUP BY CUSTOMERID) BD
        ON CD.CUSTOMERID = BD.CUSTOMERID
WHERE CD.[CUSTOMERID]='1'

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