Question

我有两个问题：一个给我一个与俱乐部有开放合同的球员名单（没有结束日期）

select ejl_players.id,ejl_players.surname ,ejl_club.short_name
from ejl_players
left join ejl_player_rights  r on (r.player_id =ejl_players.id and r.start_date=
(select max(start_date) from ejl_player_rights  where player_id=ejl_players.id  and end_date is null))
left join ejl_clubs on  ejl_club.id=r.club_id
where ejl_club.short_name is not null

其次为我提供了自2010年以来没有参加比赛的球员名单

select s.player_id from ejl_play_stat s
left join ejl_protocols p on p.id=s.protocol_id
group by s.player_id
having max(pdate)<'2010-1-1')

我想得到两个结果中都存在的球员名单，即有开放合同但没有参加2年比赛的球员。第二个查询返回10 000条记录，当我尝试将它们组合起来像Jonny White推荐时，我的查询没有返回（至少在30分钟内没有）

Answer 1

这应该这样做：

select ejl_players.id,ejl_players.surname ,ejl_club.short_name
from ejl_players
left join ejl_player_rights  r on (r.player_id =ejl_players.id and r.start_date=
(select max(start_date) from ejl_player_rights  where player_id=ejl_players.id  and end_date is null))
left join ejl_clubs on  ejl_club.id=r.club_id
where ejl_club.short_name is not null
and ejl_players.id IN (select s.player_id from ejl_play_stat s
left join ejl_protocols p on p.id=s.protocol_id
group by s.player_id
having max(pdate)<'2010-1-1')

结合两个MySQL查询结果的公共部分

1 个答案: