Simple Question About Using "Group by" Inside the Oracle XE Query Builder

Hi,
I am a new user of Oracle 10g XE and I have built and populated some tables. I am trying to create a view (make a query) via using the Query Builder. I have chosen two attributes, say course_section_ID and trainer_ID in the same table. I choose the "COUNT" function for course_section_no and I check the box for "Group By" with trainer_ID. (I would like to count the number course sections each trainer is teaching). Then I "run" the query and the same error message appears:
fail to parse SQL query:
ORA-00904: "COURSE_SECTION"."TRAINER_ID": invalid identifier
Both attribute names should be valid (as shown above).
If I only choose course_section_ID and do a COUNT on it, it gives the same error message on course_section_no.
I did try to do the same thing with the demo HR database. There were no problems with counting a field nor with grouping on a field with HR.
PLEASE HELP!
Thanks.

I have got it. When all the attribute names are in the uppercase, then I can do aggregate functions and "group by" with the GUI.

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"Sandeep Suri" <[email protected]> wrote in message
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Message was edited by: eww

Simple Question About Using "Group by" Inside the Oracle XE Query Builder

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