Question

我有一个像这样的桌子“游戏”

| team1_id | team2_id | team1_pts | team2_pts |

     1          3        101        117

     2          5        99         98

我要选择从表“ team”中退回球队名称并像这样的赢/输记录

| team_name | win | loss 

   Boston     15   11        

   Miami      13   12

我想出了如何只获得获胜次数的表，却不知道如何在同一张表中获得胜负。

Answer 1

您可以取消透视并重新加入：

select t.name, sum(is_win) as num_wins, sum(is_loss) as num_losses
from ((select (case when team1_pts > team2_pts then team1_id else team2_id end) as team_id,
              1 as is_win, 0 as is_loss
       from game g
      ) union all
      (select (case when team1_pts < team2_pts then team1_id else team2_id end) as team_id,
              0, 1
       from game g
      )
     ) g join
     teams t
     on t.team_id = g.team_id
group by t.name

Answer 2

我认为您应该重新访问数据模型。也许GAMES表具有字段GAME_ID, TEAM_ID, POINTS。您可能可以使它与目前的功能一起使用，但并不理想。

Answer 3

这可以做到：

select team_id ,
sum(case when Points > 0 then 1 else 0 end) as Win,
sum(case when Points < 0 then 1 else 0 end) as Loss

from
(
select team1_id as team_id , team1_pts - team2_pts as Points from games
union all
select team2_id, team2_pts - team1_pts as Points from games
)tbl
group by team_id

如何在mysql中选择赢/输记录

3 个答案: