All of Oracle's (non-float) number types are variable size numbers with an ordinal and a mantissa. This makes Oracle
numbervery efficient for smaller values as compared to fixed size integers, but less efficient with larger values.
NUMBERhas a maximum precision of 38 digits with a scale of -84 to +127. NUMBER consumes between 1 and 22 bytes on
disk. It is typical to specify a NUMBER with (p, s). In the absence of definition, precision of 38 and scale
indeterminatewill be assumed.
The exception to this are IEEE floating point number types which are a fixed size regardless of value.
Summary: Oracle has no fixed length equivlents to tinyint, smallint, int or bigint from other databases and can either
storethese values more or less efficiently than those databases with fixed length integer types.
-----Original Message-----
From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of Scott Marlowe
Sent: Friday, March 09, 2007 1:58 PM
To: Devrim GÜNDÜZ
Cc: Shane Ambler; Kevin Hunter; altudela@gmail.com; PostgreSQL General List
Subject: Re: [GENERAL] "oracle to postgresql" conversion
On Thu, 2007-03-08 at 16:05, Devrim GÜNDÜZ wrote:
> Hi,
>
> On Fri, 2007-03-09 at 05:21 +1030, Shane Ambler wrote:
> > NUMBER is Oracle's version of NUMERIC - Oracle will use both but
> > probably only Oracle will use NUMBER.
>
> Really? I thought Oracle's NUMBER ~ PostgreSQL's (BIG)INT?
Not sure. It let me assign a precision to it, so I figured it wasn't int based. In fact, it accepts precision up to
38,just like numeric, and it accepts non-decimal portions, i.e.:
number(20,4);
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