I have a problem that I have not been able to solve efficiently, and I'm confident that it can be done in a single query. I have a mailing list archive that I want to do some statistics on. It would tremendously ease my work if I could extract such statistics for each individual poster in one go. That would, of course, be quite easy, if I could do a SELECT DISTINCT poster FROM maillist as a subquery and use that as an argument. For instance, if I have a function postpct(date, date, varchar(30)) that calculates the percentage of posts that a certain poster ($3) is responsible in a certain time interval ($1 to $2), then how do I go about feeding that function all distinct poster entries? I've tried different things with joins, but the bit that actually worked was horribly inefficient. Martin -- GPG public key: http://home1.stofanet.dk/factotum/gpgkey.txt
