将具有相同字段的两个表连接到多个列

Question

我有一个表用户

id firstname lastname 1 | Kenny | Kim 2 | Smith | Lt 3 | James | Wagh 4 | Wales | St 5 | Stephen | Mathew

团队表

tid manager teams 1 2 3 2 2 4 3 5 1

我想要结果 Manager Team Mates Smith Lt James Wagh, Wales St, Kenny Kim

我没有得到如何加入。请注意。

Answer 1

select concat(m.firstname, ' ', m.lastname) as Manager,
       group_concat(concat(u.firstname, ' ', u.lastname) separator ', ') as `Team Mates`
from teams t
join user m on m.id = t.manager
join user u on u.id = t.teams
group by t.manager

Answer 2

在Mysql中学习连接，并尝试自己解决问题。以下链接可以为您提供很多帮助。

Joins in mysql