Another Query

Hello All,

This is another query I have to solve using SQL

Assume the following:

Transcript( stdid , crscode, Sem, Grade)
Teaching(Profid, crscode, Sem)
Professor( Id, ProfName, Dept)

The query is : find all student ids who had taken a course from each professor in the 'MAT' department

This is My attempt to solve the query :

SELECT DISTINCT T.stdid
FROM Transcript T, Professor P, Teaching Teach
WHERE Teach.profid = P.id AND P.Dept = 'MAT' AND
Teach.crscode = T.crscode

Am I so far right ?Hi

Here How I trace the answer :

1. All 'MUS' professors : MUSPROF = id ( deptid= 'MUS' Professor)
2. JOIN with Teaching to obtain which course taught by whom
PROFCRS = (Teaching (JOIN profid=id) MUSPROF)

3. STDCRS = (Transcript (JOIN crscode = crscode) PROFCRS)
4. stdid, crscode (STDCRS).

where :
= project
= select
??