Question

我正在尝试创建两列：IntlAir和DomesticAir。我的数据中有一个名为International的布尔列，当Penalty + SellingFare为International时，IntlAir会返回TRUE，而International = FALSE时，DomAir会返回该总和。

我想按月显示每个DK的金额。

我的代码是：

SELECT data.PostingMonth, data.DK_Number
     , (SELECT sum(data.Penalty + data.SellingFare)
        FROM data
        WHERE data.International = TRUE) AS IntlAir
     , (SELECT sum(data.Penalty + data.SellingFare)
        FROM data
        WHERE data.International = FALSE) AS DomesticAir
FROM data
GROUP BY data.PostingMonth, data.DK_Number
ORDER BY data.PostingMonth;

但是，输出结果是给出了所有dks和所有月份的总和，并将此值放入每一行。

有人能告诉我我做错了吗？

Answer 1

也许这就是你所需要的：

SELECT
    PostingMonth,
    DK_Number,
    SUM((Penalty + SellingFare) * IIf(International, 1, 0)) AS IntlAir,
    SUM((Penalty + SellingFare) * IIf(International, 0, 1)) AS DomAir
FROM [data]
GROUP BY PostingMonth, DK_Number

对于测试数据......

PostingMonth    DK_Number   International   Penalty SellingFare
------------    ---------   -------------   ------- -----------
1               1           False           $10.00  $100.00
1               1           True            $20.00  $200.00
2               1           False           $30.00  $300.00
1               2           False           $40.00  $400.00
1               2           False           $50.00  $500.00
1               2           True            $60.00  $600.00

...以上查询返回

PostingMonth    DK_Number   IntlAir DomAir
------------    ---------   ------- -------
1               1           $220.00 $110.00
1               2           $660.00 $990.00
2               1           $0.00   $330.00

Answer 2

有几种方法可以做到这一点，尽管你选择的那个不是其中之一

永远不确定sql访问的位置，但如果你创建一个查询来执行此操作并将其称为queryAirTotal或某些

SELECT PostingMonth, DK_Number, International, sum(Penalty + SellingFare) as AirTotal
FROM data GROUP BY PostingMonth,DK_Number,International

这将按月，dk和类型给出你的总数，然后你可以做

Select t1.PostingMonth,t1.DK_Number,t1.AirTotal as IntlAir, t2.Total as DomesticAir
From queryAirTotal t1
Left Join queryAirTotal t2 
On t1.PostingMonth = t2.PostingMonth and t1.DK_Number = t2.DK_Number
Where t1.International = TRUE and t2.International = FALSE

虽然这将错过只有国内空气而没有国际空气的月/ DK。您可以使用完全外部联接对其进行排序，我相信访问也会遇到困难。

你可以通过联盟来解决这个问题

Select t1.PostingMonth,t1.DK_Number,t1.AirTotal as IntlAir, t2.Total as DomesticAir
From queryAirTotal t1
Left Join queryAirTotal t2 
On t1.PostingMonth = t2.PostingMonth and t1.DK_Number = t2.DK_Number
Where t1.International = TRUE and t2.International = FALSE
Union
Select t1.PostingMonth,t1.DK_Number,t1.AirTotal as IntlAir, t2.Total as DomesticAir
From queryAirTotal t1
Left Join queryAirTotal t2 
On t2.PostingMonth = t1.PostingMonth and t2.DK_Number = t1.DK_Number
Where t1.International = TRUE and t2.International = FALSE

Access中的总和产生总和并在每行上放置它

2 个答案: