mysql连接三个表以分组显示

Question

I must to joing three tables but I'm not so good at this. I have three tables

tournaments

id | name |

teams 

id | name

teams_to_tournament

id | tournament_id | team_id

now i want to join this into one query so I can display all tournaments and below teams for that tournaments

Tournament name 
tournament team1,tournament team 3,...

Tournament name 2
tournament team1,tournament team 3,...

please can you help me with this.

Answer 1

You need to use GROUP_CONCAT function with GROUP BY tournament.name .

  SELECT tr.name AS tournament, GROUP_CONCAT (tm.name) AS teams
    FROM tournaments tr JOIN teams_to_tournaments tt
         ON tr.tournament_id = tt.tournament_id
         JOIN teams tm ON tm.team_id = tt.team_id
GROUP BY tr.name;

Read more about GROUP_CONCAT here .