Shuffle And Display Top X Rows
Using MySQL 4.1.10 with Coldfusion MX 6.1 on top.
A table of data gets regular inserts of hundreds of rows at a time in the same category. A categoryID field (foreign key) is assigned to each row. So the table consists of sequential blocks of data in each category--200 to 1,000 rows of category1 then 200 to 1,000 rows of category2, then some more category 1, and then some category3, etc.
I want to extract a small (and most recent) subset of the data using a select query in a way that shuffles and returns the top rows for each category like this:
Row1 Category1
Row1 Category2
Row1 Category3
Row2 Category1
Row2 Category2
Row2 Category3
Row3 Category1
Row3 Category2
Row3 Category3
Row4 Category1
This example returns 10 rows. I'd like that quantity to be dynamic so I can send the query a variable from CF. The quantity of categories is known (although does grow infrequently) so I can plug that in if necessary but I'm trying to get that quantity on the fly. That, of course, takes a simple count(*) function of the category table. I just can't figure out how to incorporate that with the rest of what is needed.
Am I the only one working this weekend? I think I'm close but I have a maze of nested loops and other CF goofiness and I'm still not there. Hoping to trash all that and find a purer database solution, if possible.
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