SQL選擇最常見的記錄

Question

我有下表：

Table
+----+------+-------+
| ID | Name | Group |
+----+------+-------+
| 0  |   a  |   1   | 
| 1  |   a  |   1   | 
| 2  |   a  |   2   |
| 3  |   a  |   1   |
| 4  |   b  |   1   |
| 5  |   b  |   2   |
| 6  |   b  |   1   |
| 7  |   c  |   2   |
| 8  |   c  |   2   |
| 9  |   c  |   1   |
+----+------+-------+

我想從該組中最常用名稱排序的特定組中選擇前20個不同的名稱。 對於組1的該示例的結果將返回abc （a-3次出現，b-2次出現和c-1次出現）。

謝謝。

Answer 1

SELECT TOP(20) [Name], Count(*) FROM Table
WHERE [Group] = 1
GROUP BY [Name]
ORDER BY Count(*) DESC

Answer 2

SELECT Top(20) 
   name, group, count(*) as occurences
FROM yourtable
GROUP BY name, group
ORDER BY count(*) desc

Answer 3

SELECT
    TOP 20
    Name,
    Group,
    COUNT(1) Count,
FROM
    MyTable
GROUP BY
    Name,
    Group
ORDER BY
    Count DESC