我有2个表:team(team_id, name)
,performance(team_id, stage, place, date)
。球队应获得积分:第一名-10分,第二名5,第三名-3分,以及4-7名1分。我需要输出球队的评分。我认为应该像这样:
SELECT team.name, CASE place
WHEN 1 points + 10
WHEN 2 points + 5
...
预期结果:
|---------------------|------------------|
| team.name | Points |
|---------------------|------------------|
| Rockers | 34 |
|---------------------|------------------|
| Batmans | 23 |
|---------------------|------------------|
| ... | ... |
|---------------------|------------------|
首先在表performance
内进行合计以计算有条件聚合的每个团队的总积分,然后将表team
与结果结合并使用RANK()
分析函数对团队进行排名:
select t.team_id, t.name,
coalesce(p.points, 0) points,
rank() over (order by coalesce(p.points, 0) desc) rnk
from team t left join (
select team_id,
sum(
case
when place = 1 then 10
when place = 2 then 5
when place = 3 then 3
when place <= 7 then 1
else 0
end
) points
from performance
group by team_id
) p on p.team_id = t.team_id