连接两个表列

Question

我有两个表，如下所示：

球队

teamid   team_name

  1      Rockstars
  2      Gangsters

团队成员

teamid    team_member_name
  1         Rob
  1         Mike
  2         John
  2         Paul

我想得到这样的结果：

teamid      team_members    team_name

   1        Rob, Mike       Rockstars
   2        John, Paul      Gangsters

我尝试了这个：（ 不起作用 ）

Select teamid, CONCAT(select team_member_name FROM team_members WHERE teams.teamid = team_members.teamid) as team_members FROM teams;

请帮忙

Answer 1

您需要的是GROUP_CONCAT ：

SELECT t1.teamid, t1.team_name, GROUP_CONCAT(t2.team_member_name)
FROM teams AS t1
INNER JOIN team_members AS t2 ON t1.teamid = t2.teamid
GROUP BY t1.teamid, t1.team_name

在这里演示