结合两个MySQL查询的公用部分导致

Question

我有两个疑问：一个给我的球员谁有俱乐部开合同（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 

二给我的球员名单列表谁自2010年

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') 

我想是谁在这两个结果存在球员名单没有玩过，谁拥有开放式的合同，但即玩家没有玩过2年。 第二个查询还给10 000条记录，当我试图将它们结合起来像强尼·怀特建议后来我查询未返回（至少在30分钟）

Answer 1

这应做到：

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')