C# 从多个表中选择的嵌套子查询

我有三张桌子：

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

我想将DataGridView填写为：

Client Name, Amount, Year, Month 

我用了这句话，但没用：

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)

---

听起来您只是想使用

内部联接

：

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

有关

联接的良好视觉表示，请参见下文：

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

请定义“它不起作用”。。你收到错误信息了吗？此外，你说你有3张桌子，但你说的是5张！顺便问一下，您是否听说过
sqljoin
？我认为这是一个更好的解释：@sgedes它现在的工作非常感谢您Much@MohamedHmmam--np，很高兴我能帮上忙@sgeddes我可以在你的代码之后这样做吗，其中Y.Year=@Yvar和M.Month=@MvarSELECT C.ClientName，P.Amount，Y.Year，M.付款后的月份P内部连接客户端C ON P.ClientID=C.ClientID内部连接日期D ON P.DateId=D.DateId内部连接年份Y ON D.YearId=Y.YearId内部连接月份M ON D.Montid=M.Montid其中Y.Year=@Yvar和M.Month=@Mvar