智能用户排名计算

Question

我有一个纸牌游戏，其中用户排名游戏赢得了多少游戏。总体评价是预先计算的，以便能够快速加载，但我有关于排名计算的问题。

排名的计算方法如下：

SET @userRank = 0; 

UPDATE t_ratings AS r 
JOIN 
    (
    SELECT 
     userId, (@userRank := @userRank + 1) as rank 
     FROM (
     SELECT 
      r.userId, 
      r.solvedCount, 
      r.playedCount 
     FROM 
     t_ratings AS r       
    ORDER BY r.solvedCount DESC , r.playedCount ASC) AS t 
) AS rt 
    ON rt.userId = r.userId 
SET r.rank = rt.rank 

但最近我开始变得有时以下错误：

Deadlock found when trying to get lock; try restarting transaction 

因此，我想知道是否有更好的方法来计算用户排名以避免死锁？

Answer 1

这就是我如何在SQL Server中执行它......不确定mySQL是否具有窗口函数，因为我不是一个mySQL人员。

With cte As 
(
     Select Rank() Over (ORDER BY r.solvedCount DESC , r.playedCount ASC) As [rank], 
       userID 
     From t_ratings As r 
) 
Update tr 
Set  [rank] = c.[rank] 
From t_ratings tr 
Join cte c 
     On tr.userID = c.userID