From: Markus Schaber <schabi@logix-tt.com>
To: Louise Catherine <r1c4n@yahoo.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Field length ??
Date: Thu, 20 Apr 2006 11:16:12 +0200
Message-ID: <4447515C.5070601@logix-tt.com> (raw)
In-Reply-To: <20060420060838.46274.qmail@web33403.mail.mud.yahoo.com>
References: <20060420060838.46274.qmail@web33403.mail.mud.yahoo.com>
Hi, Louise,
Louise Catherine wrote:
> Could anyone explain, why the field length must be add by 4 :
> result 1 : 10 + 4 =14
> result 2 : 5 + 4 = 9
I guess that it is because all variable length datatypes (and text types
are such) internally contain a 4 bytes length field.
http://www.postgresql.org/docs/8.1/interactive/xtypes.html might be a
start if you want to read more on this topic.
HTH,
Markus
--
Markus Schaber | Logical Tracking&Tracing International AG
Dipl. Inf. | Software Development GIS
Fight against software patents in EU! www.ffii.org www.nosoftwarepatents.org
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To: pgsql-sql@postgresql.org
Cc: schabi@logix-tt.com, r1c4n@yahoo.com
Subject: Re: Field length ??
In-Reply-To: <4447515C.5070601@logix-tt.com>
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