sql - 从每组中获取具有最高值的行？

Question

我有这样的数据:

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"

我如何查询此数据以获得每个组最流行(按计数)的颜色。所以结果看起来像这样:

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

Answer 1

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，不要将字段命名为 GROUP 或 COUNT。它们是关键字，会导致头痛和心碎。