With Postgres appears that TEXT is preferred over varchar(N)
http://archives.postgresql.org/pgsql-general/2006-03/msg01522.php
Any other DB (e.g. Oracle) would suggest varchar as column only stores the length of the variable (variable character length..) vs any of the fixed length datatype(s)
Anyone else?
Martin
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> Date: Wed, 13 Aug 2008 08:45:19 -0400
> From: wmoran@collaborativefusion.com
> To: jmcferreira@critical-links.com
> CC: pgsql-general@postgresql.org
> Subject: Re: [GENERAL] text .vs. varchar
>
> In response to Joao Ferreira <jmcferreira@critical-links.com>:
>
> > Hello all,
> >
> > I have a big database in which much information is stored in TEXT type
> > columns (I did this initially because I did not want to limit the
> > maximum size of the string to be stored)... but...
> >
> > .. let's say I choose an upper limit (p.ex. 200) for the string sizes
> > and I start a fresh database with VARCHAR(200).
> >
> > What tradeoffs can I expect ? disk usage ? query execution times ?
>
> See the "Tip" on this page, it answers your questions:
> http://www.postgresql.org/docs/8.3/static/datatype-character.html
>
> --
> Bill Moran
> Collaborative Fusion Inc.
> http://people.collaborativefusion.com/~wmoran/
>
> wmoran@collaborativefusion.com
> Phone: 412-422-3463x4023
>
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