Thanx this will work . My web host has PostgreSQL installed I can get a DB from there.
By the way is PostgreSQL free and if yes where can I get a copy to practise myself. ________________________________________ Rakhitha Karunarathne Web Master www.Ad-Man.tk - Free Unlimited Banner Rotators ________________________________________ ----- Original Message ----- From: "Randal L. Schwartz" <[EMAIL PROTECTED]> To: "LRMK" <[EMAIL PROTECTED]> Sent: Friday, May 21, 2004 9:24 PM Subject: Re: A MySQL Question > If you have an actual database (not MySQL, but something modern like > PostgreSQL or Oracle), you can solve this with a simple subselect and > self join. Not the most efficient, but probably more efficient than a > lot of roundtrips to the Perl side. > > For mytable which has "rank" and "score" where you want "rank" to reflect > ranking where "score" is highest, use: > > UPDATE mytable > SET rank = ( > SELECT 1+count(*) > FROM mytable AS b > WHERE b.score > mytable.score > ); > > This has the cool feature that ties are automatically assigned the > same value. For example: > > rank | score > ------+------- > 6 | 10 > 5 | 20 > 3 | 30 > 3 | 30 > 2 | 40 > 1 | 50 > > -- > Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095 > <[EMAIL PROTECTED]> <URL:http://www.stonehenge.com/merlyn/> > Perl/Unix/security consulting, Technical writing, Comedy, etc. etc. > See PerlTraining.Stonehenge.com for onsite and open-enrollment Perl training! > > -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] <http://learn.perl.org/> <http://learn.perl.org/first-response>
