在SQL中，如何为每个组选择前2行
我有一个表格如下:
NAME SCORE
-----------------
willy 1
willy 2
willy 3
zoe 4
zoe 5
zoe 6
这是示例
group by 的聚合函数只允许我得到每个name 的最高分.我想查询每个 name 的最高 2 分，我该怎么做?
The aggregation function for group by only allow me to get the highest score for each name.
I would like to make a query to get the highest 2 score for each name, how should I do?
我的预期输出是
NAME SCORE
-----------------
willy 2
willy 3
zoe 5
zoe 6
推荐答案
SELECT *
FROM test s
WHERE
(
SELECT COUNT(*)
FROM test f
WHERE f.name = s.name AND
f.score >= s.score
) <= 2
- SQLFiddle 演示
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