[Dbix-class] Joins and subqueries

Jess Robinson castaway at desert-island.demon.co.uk
Thu Jan 19 10:12:42 CET 2006


Hmm, people keep telling me that, so I guess maybe its a DB2 quirk.. *it* 
definitely is faster with the subselects in the JOIN and not the WHERE..

Hohum, guess no DB is perfect ;)

Jess


On Thu, 19 Jan 2006, Kaare Rasmussen wrote:

> > This has the added side effect on running faster, since it only does the
> > conditions once, and not once per row, as the SELECTs in the where clause
> > would do..
> 
> I don't really understand what you're telling me here. I guess it's in 
> connection with DBIC, but exactly what escapes me.
> 
> I can't imagine any db engine having trouble optimizing on this level. Except 
> maybe lightweight db's like MySQL or SQLite?
> 
> -- 
> 
> Med venlig hilsen
> Kaare Rasmussen, Jasonic
> 
> Jasonic                 Telefon: +45 3816 2582
> Nordre Fasanvej 12
> 2000 Frederiksberg      Email: kaare at jasonic.dk
> 
> _______________________________________________
> List: http://lists.rawmode.org/cgi-bin/mailman/listinfo/dbix-class
> Wiki: http://dbix-class.shadowcatsystems.co.uk/
> IRC: irc.perl.org#dbix-class
> SVN: http://dev.catalyst.perl.org/repos/bast/trunk/DBIx-Class/
> 
> 



More information about the Dbix-class mailing list