在我的sql中使用Distinct和Sum

Question

下面是我创建的表，我的目标是删除重复的结果，然后添加值。

|  username   |   value
|    Bobby    |     5
|    Bobby    |     5
|    Bobby    |     7

这是我正在寻找的结果

|  username   |   value
|    Bobby    |     12

我怎样才能做到这一点？

Answer 1

试试这个

select username, sum(value) from 
(select distinct username,value from mytbl) as tmp  group by username

Answer 2

SELECT SUM(DISTINCT value) FROM TableName Group By UserName

Answer 3

请试试这个

 select username,sum(value) from 
 (
   select username,value from tbl group by username,value
 )data
  group by name

Answer 4

这里更简单

SELECT distinct(username), sum(distinct value) AS Value from temp1

确实有效