|
Posted by "Kristen G. Thorson" on 06/03/05 16:31
Try using a temporary table. It should be pretty fast. You'd do
something like
1. Select from table1 according to search criteria
2. Insert data from #1 into temp_table1
3. Random selection from temp_table1
kgt
Brian Dunning wrote:
> I am using a routine to find 50 random records in a large MySQL
> database (about a million records) where I generate a list of 50
> random unique ID's, and then use MySQL's "in" command to find them. I
> can't use "order by rand()" due to its performance hit.
>
> But I have to take it one more step: I want to first limit my found
> set to those matching a different search criteria, and then find 50
> of those.
>
> Anyone? Can this be done all within MySQL, or is it going to require
> some humongo PHP arrays?
>
Navigation:
[Reply to this message]
|