Question

您好我有一个sql查询，它为我的数据库生成排名

SET @rownum := 0; 

SELECT 
   rank, Total, UserID_ChampID 
FROM 
   (SELECT 
       @rownum := @rownum +1 AS rank, total, UserID_ChampID 
    FROM 
       Summoner_Champions 
    WHERE 
       Champion_ID = 0  
    ORDER BY 
       Total DESC) as result

这将返回一个正确的表，如

rank  total   userid_champid
  1     379     566_0

我的问题是：我想更新表格，从

中提取这些数据

所以我想要更新是这样的代码工作

UPDATE Summoner_Champions 
SET Rank = result.rank 
WHERE Summoner_Champions.UserID_ChampID = result.UserID_ChampID

很抱歉，如果这是一个完全新手的问题，但我找不到通过子查询或解决方法使代码工作的方法

Answer 1

您可以使用SELECT查询更新查询。见下文：

SET @rownum := 0; 
UPDATE Summoner_Champions 
SET 
Rank = (SELECT rank FROM 
   (SELECT 
       @rownum := @rownum +1 AS rank, total, UserID_ChampID 
    FROM 
       Summoner_Champions 
    WHERE 
       Champion_ID = 0  
    ORDER BY 
       Total DESC) as result)

Answer 2

我认为应该这样做：

UPDATE Summoner_Champions 
SET Rank = result.rank
FROM Summoner_Champions sc LEFT INNER JOIN (your Statement for Result) result
WHERE Summoner_Champions.UserID_ChampID = result.UserID_ChampID

编辑：第二种方法，请参阅我的上一条评论：

UPDATE Summoner_Champions 
SET Rank = (@rownum + 1)
WHERE Champion_ID = 0

在查询中多次使用存储的sql表

2 个答案: