mysql - how to insert records for top 10 enteries only

Question

I have gathered top 10 users for specific task. Using the query given below.

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

Now , I need to award bonues to the top 10 gathered users only. I am not getting the idea , on how to write query for this purpose.

I need to update one field in tablename = user , field name = bonus .

Kindly guide.

Answer 1

You can use a JOIN for this purpose like

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