如何从同一张表中查找具有不同where条件的多个记录的计数 [英] How to find count of multiple records with different where conditions from same table

问题描述

我有一张这样的桌子

ID    | cid   |lightness    | darkness     | color
------|-------|-------------|--------------|---------
1     | 5     |10           | 20           | green
2     | 5     |10           | 08           | green
3     | 5     |10           | 10           | green
4     | 5     |20           | 05           | green
5     | 8     |10           | 20           | red
6     | 8     |10           | 16           | red
7     | 8     |33           | 20           | red
8     | 5     |10           | 10           | green

我想了解以下内容:

• 颜色为浅色10的记录数
• 颜色为暗20的记录数

所以输出应该是

Color    | lightness   | darkness   | Total
---------|-------------|------------|---------
green    | 4           | 1          | 5
red      | 2           | 2          | 4
Total    | 6           | 3          | 9

我已经尝试过下面的查询，但是没有带来正确的结果.

I've tried the query below but it doesn't bring the correct results.

Select color, sum(lightness), sum(darkness)
from colortable
where cid in (5,8)
and (lightness = 10 or darkness = 20)
Group by color;

推荐答案

将以下SQL保存为新查询， qryBaseCounts :

Save the following SQL as a new query, qryBaseCounts:

SELECT
    sub.color,
    sub.light_10,
    sub.dark_20,
    light_10+dark_20 AS light_plus_dark
FROM [
        SELECT
            color,
            Sum(IIf(lightness=10,1,0)) AS light_10,
            Sum(IIf(darkness=20,1,0)) AS dark_20
        FROM colortable
        WHERE
            cid In (5,8)
            AND (lightness=10
            OR darkness=20)
        GROUP BY color
    ]. AS sub;

然后，您可以在UNION查询中使用qryBaseCounts:

Then you can use qryBaseCounts in a UNION query:

SELECT
    q1.color,
    q1.light_10 AS lightness,
    q1.dark_20 AS darkness,
    q1.light_plus_dark AS [Total]
FROM qryBaseCounts AS q1
UNION ALL
SELECT
    "Total",
    Sum(q2.light_10)
    Sum(q2.dark_20)
    Sum(q2.light_plus_dark)
FROM qryBaseCounts AS q2;

这是第二次查询的Access 2007输出，使用您的 colortable 示例数据:

This is the Access 2007 output from that second query using your sample data for colortable:

color lightness darkness Total
green         4        1     5
red           2        2     4
Total         6        3     9

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