将类似的查询结果合并为一行

Question

I have

ID username group
1  philip   football
2  george   baseball
3  alice    football
4  ani      football
5  george   football

and trying to make this

username   group
philip     football
george     baseball, football
alice      football
ani        football

In other words I want to combine the grop idetms into one string like here "baysboll, football"

Answer 1

您需要GROUP_CONCAT函数

 select username, GROUP_CONCAT(group) FROM table GROUP BY Username

Answer 2

don't forget to escape the column Group with backtick in order to avoid syntax error. GROUP is a Reserved Keyword .

SELECT username, GROUP_CONCAT(`group`) 
FROM table
GROUP BY userName