我有一个房间和设备的数据库.我想查询数据库并返回一个房间列表,例如电视,收音机,卫星和冰箱(eq1,eq2,eq3,....,eqN).
我有以下SELECT语句:
select * from rooms r where
exists (select id from equipments where eq_id='eq1' and room_id=r.id)
and
exists (select id from equipments where eq_id='eq2' and room_id=r.id)
and
exists (select id from equipments where eq_id='eq3' and room_id=r.id)
.......
and
exists (select id from equipments where eq_id='eqN' and room_id=r.id)
有没有什么方法可以优化或缩短它？