MySql的sql语句涉及group/sum/limit/结果集多字段,如何写

Question

表结构和数据如下，我需要查询uid的total之和最大的前10条数据，请问sql语句如何写

uid   total
1      4
2      1
2      2
3      6
1      5
4      9

Answer 1

SELECT uid, SUM( total ) 
FROM  `test` 
GROUP BY uid
ORDER BY SUM( total ) DESC 
LIMIT 0 , 10