加盟與同場的兩個表的多個列

Question

我有一個表用戶

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

隊表

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

我想要的結果是 Manager Team Mates Smith Lt James Wagh, Wales St, Kenny Kim

我我沒有得到如何加入。 PLZ確實建議。

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

學習加入Mysql，並嘗試自己解決您的問題。以下鏈接可以幫助你很多。

Joins in mysql