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Problem with GROUP BY

Author

Topic

mattastic
Starting Member

15 Posts

Posted - 2006-10-05 : 05:47:46

Hi Folks,

I need to select course information from 2 different tables schoolid is the foreign key. so far I have this:

  SELECT schools.schoolid, schools.schoolname, courses.courseschool, courses.coursetype  FROM courses, schools WHERE courses.courseschool = schools.schoolid and courses.coursetype = 'pt' GROUP BY schools.schoolid

But i get this error:

Column 'schools.SchoolName' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

What I would like to do is display the schoolname, and then all the courses in that school. Can anyone help?

Thankyou

harsh_athalye
Master Smack Fu Yak Hacker

5581 Posts

Posted - 2006-10-05 : 05:56:52

Why grouping on School ID? Simple join wil give you what you want:

SELECT 
s.schoolname, c.courseschool, c.coursetype
FROM courses c join schools s
on c.courseschool = s.schoolid 
and c.coursetype = 'pt'

If this is not the case, please explain your scenario more clearly.

Harsh Athalye
India.
"Nothing is Impossible"

SwePeso
Patron Saint of Lost Yaks

30421 Posts

Posted - 2006-10-05 : 05:57:46

GROUP BY acts as DISTINCT too!

Peter Larsson
Helsingborg, Sweden

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2006-10-05 : 11:46:26

All non-aggregate columns of the Select should be part of Group by Clause if you use it

Madhivanan

Failing to plan is Planning to fail

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