大连理工大学软件学院数据库第二次上机答案
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1.
select course_id
from section
group by course_id
having count (distinct year)>1
select course.course_id , title
from section join course on section.course_id = course.course_id where year = '2010' and semester = 'spring'
and section.course_id in (select course_id
from section
group by course_id
having count (distinct year)>1)
with c_2010 as (
select course_id
from section
where year = '2010' and semester = 'spring'
and course_id in (select course_id
from section
group by course_id
having count (distinct year)>1))
,
ins_sla as
(select course_id ,sum(salary)as sum_sal , count (teaches.id) as ins_cnt
from teaches join instructor on teaches.id = instructor.id
where semester = 'spring' and year = '2010'
and course_id in (select course_id from c_2010)
group by course_id
)
,
sec_credit_hr as (
select time_slot_id ,sum (((end_hr - start_hr)*60+ end_min-start_min)/50)as cred_hr
from time_slot
group by time_slot_id )
,
course_hr as (
select course_id , cred_hr
from section join sec_credit_hr on section.time_slot_id = sec_credit_hr.time_slot_id
where semester = 'spring' and year = '2010'
and course_id in (select course_id from c_2010)
)
select course.course_id, title , cred_hr,sum_sal
from ins_sla join course_hr on ins_sla.course_id = course_hr.course_id
join course on ins_sla.course_id= course.course_id
2,
course takes student section
select * from section
select name ,takes.course_id , takes.semester ,takes.year , takes.sec_id ,title
from student left join takes on student.id = takes.id
left join section on takes.course_id = section.course_id
and takes.sec_id= section.sec_id
and takes.semester= section.semester
and takes.year= section.year
full join course on section.course_id = course.course_id
3.
select * from takes
select count(*)
from takes
where grade = 'F' and id = '45678'
select count (*)
from takes
where grade = 'F' and id in (select id
from student
where dept_name in (select dept_name from student where
id = '45678' )
)
select count (*)
from takes
where exists (select *
from student as s join student as t
on s.dept_name= t.dept_name
where s.id = takes. id and t.id = '45678') and grade = 'F'
select id ,name ,dept_name ,
(select count(*)
from takes
where grade = 'F' and id = student.id)as fail ,
(
select count (*)
from takes
where grade = 'F' and id in (select id
from student as s1
where dept_name in (select dept_name from student as s2 where id = student.id )
)) as all_fail
from student
4.
²î¼¯¿ÉÒÔÓÃnot in ±íʾ
select distinct takes.id
from instructor join teaches on instructor.id = teaches.id
join takes on takes.course_id = teaches.course_id
and takes.sec_id=teaches.sec_id
and takes.semester = teaches.semester
and takes.year = teaches.year
where instructor.dept_name= 'ÄÚ¹¦Ñ§Ôº'
µÃµ½Ñ¡ÐÞÄÚ¹¦Ñ§ÔºÀÏʦËù½ÌÈ«²¿¿Î³ÌµÄѧÉú
with stu_all_id as (
select id
from student
where not exists (
(select course_id
from teaches join instructor on instructor.id = teaches.id where dept_name= 'ÄÚ¹¦Ñ§Ôº')
except
(select course_id
from takes
where takes.id = student.id and grade is not null )