Question

我的情况是这样的：我有2个mysql表：用户和得分。

表用户就像：id，name。表得分就像：id，point，user_id;

我想取10个用户获得高分的名称，但我不知道我必须使用哪种查询。有人可以帮帮我吗？

Answer 1

最简单的答案是使用ORDER BY和LIMIT，但它不能处理具有相同点的重复用户。

SELECT  a.*, b.*
FROM    user a
        INNER JOIN scores b
            ON a.id = b.user_ID
ORDER   BY b.point DESC
LIMIT   10

要处理重复点，您可以使用包含前N 分数的子查询。

SELECT  a.*, b.*
FROM    user a
        INNER JOIN scores b
            ON a.id = b.user_ID
        INNER JOIN
        (
            SELECT  point
            FROM    scores
            GROUP   BY point
            ORDER   BY point DESC
            LIMIT   10
        ) c ON b.point = c.point
ORDER   BY b.point DESC

SQLFiddle Demo (you can see the difference between the two queries)

Answer 2

您可能希望使用INNER JOIN查询，并按points列降序排列所需的所有相关数据并将结果限制为10

SELECT *
FROM user a
LEFT JOIN scores b
ON a.id = b.user_id
ORDER BY b.point DESC
LIMIT 10

Answer 3

使用： -

SELECT *
FROM user as u,scores as s Where u.id = s.user_id
ORDER BY s.point DESC
LIMIT 10

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3 个答案: