合并两个查询于一体，SQL的MS Access 2007

Question

我有一个表与以下记录：

date, name, amount, balance, debit_credit. 

在该表中对过一些时间几家公司的观察样本。

我想下面的表格让与以下记录：

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; 

我写了下面的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curiouse如何结合在一个表中的输出（见上文）查询与不同的条件？ 此外，我想知道，如何将日期设置为此查询的参数？

我会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：

• MS Access: iif Function
• Ms access select data greater than datetime range