Question

如果我们有表格，那么排行榜最有效的SQL查询是什么：

[UserID], [Points]

我希望结果按点和Rank列排序。

Answer 1

在SQL Server 2008中，您可以使用Ranking functions：

SELECT UserId,
       Points,
       RANK() OVER(ORDER BY Points DESC) AS Rank
FROM LeaderBoards
ORDER BY Points DESC

A MySql rank could be something like this:

SELECT UserId,
       Points,
       @curRank := @curRank + 1 AS Rank
FROM LeaderBoards l, (SELECT @curRank := 0) r
ORDER BY Points DESC

Answer 2

查询应为：

SELECT UserID，Points FROM table ORDER BY Points

在您使用的任何显示技术（即php等）中生成排名列可能更容易。它可以在大多数SQL中完成，但语法会有所不同。

Answer 3

这是一个利用join的解决方案：

SELECT t1.UserID, t1.Points, COUNT(t2.Points) AS Rank
FROM LeaderBoards t1
JOIN LeaderBoards t2 ON t1.Points < t2.Points OR (t1.Points=t2.Points and t1.UserID = t2.UserID)
GROUP BY t1.UserID, t1.Points
ORDER BY t1.Points DESC, t1.UserID DESC;

我在MySQL上测试了这个。有关此更详细的文章，请参阅： http://www.artfulsoftware.com/infotree/qrytip.php?id=460

用于排序排行榜的SQL查询

3 个答案: