Having trouble with join query

Question

Hi,
I have two tables in my database, class and document. They look like this:
Class
Class
classdescription
Document
documentid
class
document.class is a foreign key pointing to class.class. I want to find out how many document there are for each class, so I have the SQL statement:
SELECT class.class, count(class.class) as numDocs, classDescription from class, document where class.class = document.class group by class.class, classDescription order by numDocs DESC
However, if there is a class with no document, I also want it listed with the value 0 for numdocs, however this query doesnt seem to return class which have no documents.
Can anyone provide me with help for this?
Thanks!

Answer 1

Could this be what you wanted?
SELECT   CLASS.CLASS, COUNT (document.documentid) AS numdocs, CLASS.classdescription
    FROM CLASS, document
   WHERE CLASS.CLASS = document.CLASS(+)
GROUP BY CLASS.CLASS, CLASS.classdescription
ORDER BY numdocs DESC;C.