More than 1 column in the group by clause

DB Version:10gR2
I understand the basics of GROUP BY clause. I have a question on why we have on more than 1 columns in GROUP BY clause.
In the below example, the course name by itself does not make up a group. A Course name plus its BeginDate make up a group. This is the whole point of having more than 1 columns in the GROUP by clause. Right?
SQL> select r.course, r.begindate , count(r.attendee) as attendees
3   from registrations r
4   group by r.course, r.begindate
5   order by course
6 /
COURSE BEGINDATE      ATTENDEES
JAVA    12/13/1999           5
JAVA    2/1/2000             3
OAU     8/10/1999            3
OAU     9/27/2000            1
PLS     9/11/2000            3
SQL     4/12/1999            4
SQL     10/4/1999            3
SQL     12/13/1999           2
XML     2/3/2000             2

ExpansiveMind wrote:
Thanks Dmorgan. I am just learning the basics of GROUP BY clause. I have noticed that all Non-aggregate columns in SELECT list have to be present in the GROUP BY clause. I thought it was a "syntactical requirement". Now, i realise that these columns are present in the GROUP BY clause because only a combination of columns make up a group.Well, it is a bit of both actually. It is a syntactic requirement that all non-aggregated columns in the select list must appear in the group by clause. However, the non-aggregated columns in the select list is what defines your group. Your two examples define two different groups, and would answer two different questions.
John

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