| Oracle 9i Guidance [message #6953] |
Tue, 13 May 2003 11:06  |
Nazma Bepat
Messages: 34
Registered: May 2003
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CAn someone please help me out. I am having a really hard time to figure ou this one.
I have to write a query to display the student id, number of courses and the average actual grade for all courses by that student using the “Grade Table. Create an alias for each column. Round the average actual grades to two decimal places.
Any guidance would be greatly appreciated.
Thanks
Nazma
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| Re: Oracle 9i Guidance [message #6965 is a reply to message #6953] |
Wed, 14 May 2003 00:37  |
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Maaher
Messages: 7065
Registered: December 2001
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Senior Member |
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Hello again, in one of your previous posts, Barbara Boehmer has asked you to give table descriptions in your posts. Again, you failed to do so. without the proper details we can only guess what might be the proper answer. In this case, I assume the table looks like this:GRADE_TABLE
-----------
STUDENT_ID NUMBER
COURSE_ID NUMBER
GRADE NUMBER
....
Anyway:
SELECT student_id <B>student</B> -- <A HREf='http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96540/statements_103a.htm#2080329' Target=Blank>column alias</A>
, count(course_id) <B>courses</B>
, <A HREF='http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96540/functions103a.htm#SQLRF00698' Target=Blank>round</A>(<A HREF='http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96540/functions11a.htm#SQLRF00609' Target=Blank>avg</A>(grade),2) <B>average</B>
FROM grade_table
GROUP BY student_id -- you want the results from the calculations
-- grouped by student
MHE
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