通过用点对用户进行排名来创建视图

Question

我正在使用此查询并收到错误#1351 - View's SELECT contains a variable or parameter

CREATE VIEW v AS
SELECT  name,points,sno ,@rownum := @rownum + 1 AS rank
FROM  `users`,(Select @rownum := 0)
GROUP BY   name,sno
ORDER BY CAST(points AS UNSIGNED) DESC;

如何使用此方法创建视图？我非常感谢任何帮助。谢谢你。

Answer 1

假设SNO在users表中实际上是唯一的，您可以在没有变量的视图中执行此操作。我不是说你想要，但你可以：

CREATE VIEW v AS
    SELECT  name,
            (select count(*)
             from users u2
             where u2.points > u.points or
                   u2.points = u.points and u2.sno <= u.sno
            ) as rank
    FROM  `users` u;

Answer 2

正如CREATE VIEW Syntax所述：

  

  
• SELECT语句不能引用系统或用户变量。