我有 3 张桌子players
positions
players_national
我需要SELECT DISTINCT
定位players_national
player_positon 与players
表相关联的位置。
我的表是这样的:
Players Table
-----------------------------------------------------------------------
| player_id player_name player_team player_position |
-----------------------------------------------------------------------
1 KAKA 12 1
2 Ronaldo 7 2
3 Adriano 10 2
Positions Table
-------------------------------------------------------
| position_id position_name |
-------------------------------------------------------
1 Midfield
2 Forward
Players_national Table
-------------------------------------------------------------------
| player_id player_team player_national_team |
-------------------------------------------------------------------
1 12 4
2 7 4
3 19 4
My Dream output is this
---------------------------------------------------
| player_national_team position |
---------------------------------------------------
4 1
4 2
我的查询是这样的:
SELECT DISTINCT players. * , positions. * , players_national. *
FROM players
LEFT JOIN positions ON positions.position_id = players.player_position
LEFT JOIN players_national ON players_national.player_id = players.player_id
WHERE players_national.player_id = players.player_id AND players_national.player_national_team = 4