Question

我收集了前十名用户的特定任务。使用下面给出的查询。

$sqlsum=mysql_query("SELECT `userid`, SUM(`points`) as `total` FROM 
    `tablename` GROUP BY `userid` ORDER BY total DESC LIMIT 10");

现在，我需要向前十名聚集用户颁发奖金。我不知道如何为此目的编写查询。

我需要更新tablename = user，field name = bonus。

中的一个字段

请指导。

Answer 1

您可以尝试：

$query = "UPDATE user 
          SET bonus=$some_bonus 
          WHERE id IN (
          SELECT userid from (select userid,sum(points) as total 
          FROM table_name GROUP BY userid ORDER BY total DESC LIMIT 10))";

这里id是给用户的用户表的id，$ some_bonus将是你想要奖励给前10名用户的奖励。

Answer 2

您可以将JOIN用于此目的，例如

UPDATE `tablename` a 
JOIN 
(
SELECT `userid`, SUM(`points`) as `total` FROM 
    `tablename` GROUP BY `userid` ORDER BY total DESC LIMIT 10
) tab ON a.`userid` = tab.`userid`       
set a.Bonus = 2000

如何仅为前10个条目插入记录

2 个答案: