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?
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