抓住每个组中具有最高价值的行? [英] Grabbing the row with the highest value from each group?

问题描述

我有如下数据:

Table
Group: "A" , Color: "Blue", Count: "400"
Group: "A" , Color: "Green", Count: "3"
Group: "A" , Color: "Yellow", Count: "6"
Group: "A" , Color: "Red", Count: "1"
Group: "B" , Color: "Purple", Count: "243"
Group: "B" , Color: "Green", Count: "2"
Group: "B" , Color: "Yellow", Count: "7"

如何查询此数据以获得每个组最流行(按计数)的颜色.因此结果将如下所示:

How can I query this data to get for each group the most popular (by count) color. So the result would look like this:

Result
Group: "A", Color: "Blue"
Group: "B", Color: "Purple"

推荐答案

SELECT Group, Color
FROM MyTable t
INNER JOIN (SELECT Group, Max(CAST(Count as int)) as Ct
            FROM MyTable
            GROUP BY Group) Sub
   ON sub.group = t.group
   AND sub.ct = t.count

顺便说一句，请勿将字段命名为GROUP或COUNT.它们是关键字，将导致头痛和伤心欲绝.

As an aside, don't name a field GROUP, or COUNT. They are keywords and will lead to headaches and heartbreak.

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