SQL中的最大數量

Question

我有一個聯盟球員的模式，看起來像下面的模式。

Player (playerid integer, mentorid integer, leagueid integer, pay integer) 
League (leagueid integer, leaguename text) 

我想找到有球員和解決方案的最大數量應當考慮的場景，有玩家最大數量的結果，卻應該有超過一個聯賽聯賽 - leaguename，玩家數量由leaguename.How排序我明白嗎？

Answer 1

with x as (
select l.leaguename, count(distinct p.playerid) as player_count 
from player p join league l on p.leagueid = l.leagueid 
group by l.leaguename) 
, y as (select max(player_count) player_count from x) 
select x.leaguename, y.player_count 
from x join y on x.player_count = y.player_count 
order by x.leaguename 

Answer 2

你可以試試這個：

select leaguename, player_count from League l,(
select leagueid, count(leagueid) as player_count from Player 
group by leagueid having count(leagueid) >= All (select count(leagueid) from Player group by leagueid)) t 
where l.leagueid = t.leagueid 
order by leaguename