数据库实验

Posted 2022-10-09 war1111

2-1

create or replace view test2_01 as 
select sid,name
from pub.student
where sid not in (select sid from pub.student_course);

 2-2

create or replace view test2_02 as
select sid,name
from pub.student
where sid in (select sid from pub.student_course where cid in (select cid from pub.student_course where sid=200900130417));

 2-3

create or replace view test2_03 as
select sid,name
from pub.student
where sid in (select sid from pub.student_course where cid in (select cid from pub.course where fcid=300002));