查询返回多个记录作为一个字符串

Question

students: id, last_name 

1 Robinson 
2 Norris 
3 Smith 

sports: id, title 

1 Basketball 
2 Baseball 
3 Football 

students_sports: student_id, sport_id 

1 3 
1 2 
2 1 
2 3 
3 3 
3 1 

这个查询

select 
last_name, sports.title as sport 
from 
students s 
left join 
students_sports ss 
on 
s.id = ss.student_id 
left join 
sports 
on 
ss.sport_id = sports.id 

这将返回类似：

last_name  sport 
Robinson  basketball 
Robinson  baseball 
Smith   football 
Smith   baseball 
Norris   baseball 
Norris   basketball 

我想修改的查询返回的结果是这样的：

last_name  sport 
Robinson  basketball, baseball 
Smith   football, baseball 
Norris   baseball, basketball 

Answer 1

正如@brad所示：

select 
last_name, group_concat(sports.title) as sport 
from 
students s 
left join 
students_sports ss 
on 
s.id = ss.student_id 
left join 
sports 
on 
ss.sport_id = sports.id 
group by s.id 

编辑：通过更新该组..