Question

我有一张包含以下记录的表格：

date, name, amount, balance, debit_credit.

此表格表示在一段时间内对几家公司进行观察的样本。

我想使用以下记录制作下表：

aggregate1, aggregate2, aggregate3, aggregate4, name.

其中：

aggregate1 - sum of amount for all names where balance equals 1500, 1501;
aggregate2 - sum of amount for all names where balance equals 1400, 1401;
aggregate3 - sum of amount for all names where balance equals 1300, 1301;

我编写了以下SQL查询来计算aggregate1。

SELECT Sum(Firms.amount)/100 AS [aggregate1], Firms.name
FROM Firms
where Firms.Balance in (1500, 1502)
GROUP BY Firms.name;

但是，我是如何将一个表（见上文）中的输出与不同的条件组合在一起？此外，我想知道如何设置日期作为此查询的参数？

我将非常感谢您的建议和解决方案。谢谢您的考虑。

Answer 1

也许是这样的：

SELECT
    Firms.name,
    SUM(iif(Firms.Balance IN (1500, 1502),Firms.amount,0))/100 AS aggregate1,
    SUM(iif(Firms.Balance IN (1400, 1401),Firms.amount,0))/100 AS aggregate2,
    SUM(iif(Firms.Balance IN (1300, 1301),Firms.amount,0))/100 AS aggregate3
FROM Firms
WHERE Firms.date >= #12/6/2012 3:54:15 PM#  
GROUP BY Firms.name;

参考文献：

将两个查询合并为一个SQL MS Access 2007

1 个答案: