-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Fri, 16 Nov 2007 13:03:23 -0600 Ron Johnson <ron.l.johnson@xxxxxxx> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 11/16/07 12:54, Sam Mason wrote: > > On Fri, Nov 16, 2007 at 03:50:20PM -0300, Jo??o Paulo Zavanela > > wrote: > >> How many fields is recomended to create a primary key? > >> I'm thinking to create one with 6 fields, is much? > > > > Normally a primary key would just be a single column. When you > > start going to that many I'd probably have a serial column as the > > primary key, and a UNIQUE index on those six fields. Depends on > > what you're doing, though unless you've got a few years experience > > I'd be tempted to stay away from primary keys of more than a single > > column. > > Fie on you evil synthetic key lovers. Long live the Natural Key! Right with you there buddy. Let's get the pitchforks! Joshua D. Drake > > - -- > Ron Johnson, Jr. > Jefferson LA USA > > %SYSTEM-F-FISH, my hovercraft is full of eels > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.6 (GNU/Linux) > > iD8DBQFHPel7S9HxQb37XmcRAmPZAJ9mml45XtPRSCrAiQ7K+LCwWf5J5QCgvaSp > Zs5F1SU5CNQvnoofaxkAoIY= > =9ipR > -----END PGP SIGNATURE----- > > ---------------------------(end of > broadcast)--------------------------- TIP 2: Don't 'kill -9' the > postmaster > - -- === The PostgreSQL Company: Command Prompt, Inc. === Sales/Support: +1.503.667.4564 24x7/Emergency: +1.800.492.2240 PostgreSQL solutions since 1997 http://www.commandprompt.com/ UNIQUE NOT NULL Donate to the PostgreSQL Project: http://www.postgresql.org/about/donate PostgreSQL Replication: http://www.commandprompt.com/products/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHPetVATb/zqfZUUQRAp29AJ49UhU3LWyaIJq+F/vCkrZIMBIi8QCdEesA EqTIjelyYrqR8+JN1Y3sPwM= =AlLT -----END PGP SIGNATURE----- ---------------------------(end of broadcast)---------------------------TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match