根据日期比较多个SQL表数据

Question

我有两个SQL表，其中一个包含销售订单日期和当天的总数。然后，我有另一个表，其中包含发票日期和当天的总发票。这两个表上都有一些日期，根本没有记录。

我需要您的帮助才能将这两个表连接起来，并获取下图所示的每天的销售订单总额和发票总额。

Answer 1

也许最简单的方法是汇总UNION ALL

的结果

示例

Select [Date]  = OrderDate
      ,Sales   = sum(Sales)
      ,Invoice = sum(Invoice)
From  (
        Select OrderDate
              ,Sales   = sum(LovalValue)
              ,Invoice = cast(null as money)
         From  SalesOrd_HDR
         Group By OrderDate
        Union All
        Select TransDate
              ,cast(null as money)
              ,sum(Amount)
         From  DR_Trans
         WHERE TRANSTYPE = '1'
         Group By TransDate
      ) A
 Group By OrderDate

Answer 2

您可以通过两个聚合子查询和一个FULL OUTER JOIN来实现：

SELECT 
    COALESCE(ord.oday, inv.iday) AS date,
    ord.ototal AS order_total,
    inv.itotal AS invoice_total
FROM 
(
    SELECT
        CAST(orderdate AS DATE) AS oday,
        SUM(localvalue) AS ototal,
    FROM dbo.SALESORD_HRD
    GROUP BY CAST(orderdate As DATE)
) AS ord FULL OUTER JOIN (
    SELECT
        CAST(transdate AS DATE) iday,
        SUM(amount) itotal,
    FROM dbo.DR_TRANS
    WHERE TRANSTYPE = '1'
    GROUP BY CAST(transdate As DATE)
) AS inv
    ON ord.oday = inv.iday