sql - MS-Access SQL 的条件过滤困难

Question

我在 MS-Access 中有一个查询，我试图根据条件提取一些值，然后对结果求和。

SELECT SchedulingLog.UserID, SchedulingLog.Category, Sum(SchedulingLog.Value) AS Gain, Sum(SchedulingLog.Value) AS Used, [Gain]+[Used] AS [Left]
FROM SchedulingLog
GROUP BY SchedulingLog.UserID, SchedulingLog.Category, [Gain]+[Used]
HAVING ((
(SchedulingLog.Category) Like "DH*" Or 
(SchedulingLog.Category) Like "Com*") AND 
("Where[CatDetai]" Like "Gain*") AND 
("Where[CatDetai]" Like "Used*")
);

有了这些数据SchedulingLog...

Userid LogDate EventDate Category CatDetail Value
abc123  1-1-11    7-2-11 DH       DH Used      -1
abc123  1-1-11    7-4-11 DH       DH Gain       1

...我希望我的查询给我这个结果集：

Userid Category Gain Used Left
abc123 DH          1   -1    0

Answer 1

以下 SQL 根据您在 Access 2007 中的示例数据进行测试，返回您所要求的内容。

SELECT
    Userid,
    Category,
    Sum(IIf(CatDetail ALike '%Gain', [Value], 0)) AS Gain,
    Sum(IIf(CatDetail ALike '%Used', [Value], 0)) AS Used,
    [Gain] + [Used] AS [Left]
FROM SchedulingLog
GROUP BY
    Userid,
    Category

但是，如果您实际上不需要查看 and 的单独值Gain，Used那么这样做会更简单：

SELECT
    Userid,
    Category,
    Sum([Value]) AS [Left]
FROM SchedulingLog
GROUP BY
    Userid,
    Category