SQL HELP〜對於每個計算機科學類，打印CNO，sectno，學生的平均GPA在類

Question

student(sid, sname, sex, age, year, gpa) 
dept(dname, numphds) 
prof(pname, dname) 
course(cno, cname, dname) 
major(dname, sid) 
section(dname, cno, sectno, pname) 
enroll(sid, grade, dname, cno, sectno) 

select e.cno, e.sectno, avg(s.gpa) 
from enroll e, student s 
where dname = 'Computer Science' and s.sid = e.sid 
group by dname, cno, sectno 

結果被錄取對於同一班級的每個單獨部分（sectno），但不知道如何獲得兩節課每班的平均目標（相同的cno），分兩行顯示？

謝謝〜

我想要的結果是

任何幫助，將不勝感激〜

Answer 1

嘗試要麼

select tmp.course_number, sect.sectno as section_number, tmp.avg_gpa 
from (
    select e.cno as course_number, avg(s.gpa) as avg_gpa 
    from enroll e 
    join student s on s.sid = e.sid 
    where dname = 'Computer Science' 
    group by dname, cno 
) as tmp 
join section sect on sect.cno = tmp.course_number 
where sect.dname = 'Computer Science' 

或只是sectno從原始組中刪除條款，看看你給了什麼。