根据 SQL 中的比赛结果创建记分卡报告

Question

这是我输入的锦标赛比赛结果示例，结果列表示是团队 1 还是团队 2 赢得了比赛（0 代表平局）。

score table -
-----------------
t1   t2   result
-----------------
us   aus    1
aus  sa     2
sa   us     0
us   nz     1

Desired output -
---------------------------------
team    played  won lost    draw
---------------------------------
aus     2       0     2     0
us      3       2     0     1
nz      1       0     1     0
sa      2       1     0     1

这是我想出的解决方案，但是否可以在不使用 UNION 运算符的情况下解决它？

select 
  t1 as team,
  count(1) as played,
  sum(case when result=1 then 1 else 0 end) as won,
  sum(case when result=2 then 1 else 0 end) as lost,
  sum(case when result=0 then 1 else 0 end) as draw
from 
(select
   t1, 
   t2, 
   result
 from score
 union
select
   t2, 
   t1, 
   case when result=1 then 2
        when result=2 then 1
        else 0 end as result
 from score
) t
group by t.t1

Answer 1

您可以通过 CROSS APPLY 反透视您的数据，然后对结果执行聚合

例子

Select  Team
       ,played = count(1)
       ,won    = sum(case when Val=1 then 1 else 0 end)
       ,lost   = sum(case when Val=2 then 1 else 0 end)
       ,draw   = sum(case when Val=0 then 1 else 0 end)
From  score A
Cross Apply ( values (T1,Result )
                    ,(T2,case when result=1 then 2 when result=2 then 1 else 0 end)
           ) B(Team,Val)
 Group By Team

结果

team    played  won lost    draw
aus     2       0   2       0
nz      1       0   1       0
sa      2       1   0       1
us      3       2   0       1

根据 SQL 中的比赛结果创建记分卡报告

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