looks like you completely misunderstood my question.
First of all, I wonder why the same query divided up in half - and
using temporary table works as expected, and with everything together
doesn't. And about rand(), it was tested on large enough set of runs,
that I don't think it is to blame.
The queries do everything I wanted it to do, and - no - doing it in
software is just baaad, and doesn't do.
