Question

SELECT c.cname, COUNT(e.ccode) 
FROM class c
INNER JOIN enrolled e ON e.ccode = c.ccode
WHERE room = 'MB100'
AND e.ccode = < 10;

I’m trying to find the names of courses that are in room MB100 that have less than 10 students, where am i going wrong?

Answer 1

You are missing the group by c.cname, Try this:

SELECT c.cname, COUNT(e.ccode) 
FROM class c
INNER JOIN enrolled e ON e.ccode = c.ccode
WHERE room = 'MB100'
Group by c.cname
Having e.ccode =< 10;