如何选择dorm_id(70)?
dorm_id是家庭ides,设施是主题的属性,每个家庭都有一些设施,例如家庭id 70有这些设施(12,13,14,17,18),如何从dorm_id列中选择70号它是一个搜索查询,可以找到具有所有功能的dorm_id
提前致谢
答案 0 :(得分:1)
如果您将facility_id放在名为table_facility的表中,则可以这样做:
select dorm_id
from table_dorm
group by dorm_id
having count(distinct facility_id)=(select count(distinct facility_id)
from table_facility)
如果您将它们放在同一个表中,则可以使用此查询执行此操作:
select dorm_id
from table_dorm
group by dorm_id
having count(distinct facility_id)=(select count(distinct facility_id)
from table_dorm)
答案 1 :(得分:0)
我解决了这个问题,你需要的只是你没有仔细看到这张照片!
SELECT dorm_id
FROM dorm
WHERE facility_id IN (12, 13, 14)
GROUP BY doctor_id
HAVING COUNT(DISTINCT ability_id) = 3