嵌套子查詢從比拖表的更多選擇

Question

我有三個表：

Years (YearId,Year) 
Months (MonthID,Month) 
Date (DateID,YearID,MonthID) 
Client (CLientID,ClientName) 
Payment (PayID,ClientID,DateID,Amount) 

我想在DataGridView中填寫爲：

Client Name, Amount, Year, Month 

我用這個說法，但事實並非如此工作：

Select * From (select Year From Years Where YearID = (Select YearId From Date Where dateID = (Select DateID From Payment))),(Select Month From Months Where Monthid = (Select MonthID From Date Where dateID = (Select DateID From Payment))),(Select ClientName From Client Where ClientID = (Select ClientID From Payment),(Select amont From Payment) 

Answer 1

聽起來你只是希望用INNER JOINs：

SELECT C.ClientName, 
    P.Amount, 
    Y.Year, 
    M.Month 
FROM Payment P 
    INNER JOIN Client C 
     ON P.ClientID = C.ClientID 
    INNER JOIN Date D 
     ON P.DateId = D.DateId 
    INNER JOIN Years Y 
     ON D.YearId = Y.YearId 
    INNER JOIN Months M 
     ON D.MonthId = M.MonthId 

爲JOINs良好的視覺表現見下文：

Visual representation of JOINS