mysql - 通过组合三个不同的sql查询的数据来获取公共(public)数据

Question

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Answer 1

drop table if exists enquiry;
create table enquiry (id integer, statno integer);
insert into enquiry values 
(12,100),(12,102),(12,110),
(18,102),(18,112),(18,118),
(21,101),(21,102),(21,120);

select distinct statno from enquiry where 
statno in (select statno from enquiry where id=12)
and statno in (select statno from enquiry where id=18)
and statno in (select statno from enquiry where id=21)
;