Even if I do a basic select (with no joins) for a given catalog_number,
I still get two rows back.
Even if I do this simple query, while hardcoding in a catalog_number:
SELECT subject, catalog_number FROM course_subject
WHERE (catalog_number = 520) AND
((subject = 'ME') OR ((course_offer_number = 1) AND (subject NOT LIKE
'ME')))
I still get two rows back:
subject catalog_number
ME 520
MSE 520
So I'm not sure what else I need in my Where Clause
Thanks bunches.
Tina
Peter Brawley wrote, On 6/26/08 3:33 PM:
Tina,
>for some reason, it still pulled all of the rows
Are there multiple rows which meet your WHERE condition? If so, and if
you want just one of them, your need another WHERE condition.
PB
-----
Tina Matter wrote:
Peter,
That was the first query I tried, but for some reason, it still
pulled all of the rows. So I've been trying to come up with another
solution.
Any other ideas?
Thanks for the reply.
Tina
Peter Brawley wrote, On 6/26/08 2:12 PM:
Tina
>Basically, if the subject is "ME", then I want to select that row.
>If there is no row for that catalog_number that has a subject of "ME",
>then I want to grab the row that has a course_offer_number of '1'
>and a subject that is not equal to "ME".
Is this what you mean?
SELECT ...
FROM course_table c
JOIN course_subject s ON c.course_id=s.course_id
WHERE s.subject="ME" OR (s.course_offer_number=1 AND s.subject <>
"ME");
PB
Tina Matter wrote:
I have two tables:
1.) A course table (stores course_id and catalog_number)
2.) A course_subject table (stores course_id, catalog_number,
subject, and course_offer_number)
For each row in the course_table, there can be many rows in the
course_subject table, due to cross-postings among different
departments.
Here is what I'd like to do.
I would like to grab a list of catalog_numbers from the
course_table, but I only want one row in the course_subject table.
Basically, if the subject is "ME", then I want to select that
row. If there is no row for that catalog_number that has a
subject of "ME", then I want to grab the row that has a
course_offer_number of '1' and a subject that is not equal to "ME".
I am basically only grabbing the subject field from the
course_subject table. If an "ME" subject exists for a
catalog_number, grab that one. Otherwise, grab whatever other one
exists. This is assuming that there will only be one other one.
Does this make sense? I'd really like to know if there's a way to
do this in one query. I can probably do it in PHP with multiple
selects, building my list as I go. But if there's a fancy way to
do this in one query, then I'd much rather do it that way.
Thanks for any help.
Tina
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--
*Tina Matter*
Web Software Developer
Department of Mechanical Engineering
University of Michigan
734-763-3184
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