按存储在另一个 Table 中的日期查找以前的记录

Question

所以我有 2 个表，一个记录一天结束时收银机上的现金以及第二天还剩多少钱，另一个记录基本的日期记录（表不能连接）所有看起来像这样的：

    RegistersTable
------------------
Register_ID| DATE
5          | 02/02/2012
8          | 04/02/2012
1          | 10/02/2012

CashTable
----------------
Register_ID|CashEOD|CashFND
8          |3235   |325
5          |6843   |435
1          |1236   |1953

所以我想要得到的是 select 应该 return 这个

的声明

RegisterID|      DATE|CashEOD|PrevCashFND
1         |10/02/2012|1236   |325
8         |04/02/2012|3235   |435
5         |02/02/2012|6843   |0/Null

从CashTable上的一个RegisterID开始，在RegistersTable中按DATE找到之前的RegisterID，得到之前的CashFND，所以最终目的是知道当天卖了多少。一天结束时的现金减去前一天留在收银机上的现金应该告诉我这一点。提前致谢。

Answer 1

请尝试以下操作 - 希望对您有所帮助：

SELECT
    D.RegisterID,
    D.[DATE],
    CashTable.CashEOD,
    CashTable_Prev.CashFND AS PrevCashFND
FROM
    (
        SELECT 
            A.RegisterID,
            A.[DATE],
            B.RegisterID AS PrevID
        FROM
            RegistersTable A
            INNER JOIN RegistersTable B ON A.RegisterID <> B.RegisterID AND A.[DATE] > B.[DATE]
            INNER JOIN
            (
                SELECT 
                    _innA.RegisterID,
                    _innB.RegisterID As PrevID,
                    MIN(_innA.[DATE] - _innB.[DATE]) AS MinDateDiff
                FROM
                    RegistersTable _innA
                    INNER JOIN RegistersTable _innB ON _innA.RegisterID <> _innB.RegisterID AND _innA.[DATE] > _innB.[DATE]
                GROUP BY
                    _innA.RegisterID,
                    _innB.RegisterID
            ) C
                ON A.RegisterID = C.RegisterID AND B.RegisterID = C.PrevID AND (A.[DATE] - B.[DATE]) = C.MinDateDiff
    ) AS D
    INNER JOIN CashTable 
        ON CashTable.Register_ID = D.RegisterID
    INNER JOIN CashTable AS CashTable_Prev
        ON CashTable_Prev.Register_ID = D.PrevID

按存储在另一个 Table 中的日期查找以前的记录

Find Previous record by date stored in another Table

sql-server