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Date: Fri, 10 Jan 2025 16:13:05 +0700
From: Vladlen Popolitov <v.popolitov@postgrespro.ru>
To: Igor Korot <ikorot01@gmail.com>
Cc: Christophe Pettus <xof@thebuild.com>, "David G. Johnston"
 <david.g.johnston@gmail.com>, Ron Johnson <ronljohnsonjr@gmail.com>,
 "pgsql-generallists.postgresql.org" <pgsql-general@lists.postgresql.org>
Subject: Re: Postgres do not support tinyint?
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Igor Korot писал(а) 2025-01-09 02:40:
> Hi, Christopphe,
> 
> On Wed, Jan 8, 2025 at 1:34 PM Christophe Pettus <xof@thebuild.com> 
> wrote:
>> 
>> 
>> 
>> > On Jan 8, 2025, at 11:30, Igor Korot <ikorot01@gmail.com> wrote:
>> > There is no boolean - it is 0-4 inclusive.
>> 
>> Unless you have somehow gotten PostgreSQL running on an IBM 7070, the 
>> range 0-4 can be represented by three binary digits, aka booleans. :-)
> 
> The only booleans I know of are 0 and 1. ;-)
> 
>> 
>> To be serious, though, the situation is:
>> 
>> 1. If there are just one or two tinyints, having a tinyint type 
>> wouldn't save any space in the row.
> 
> No it is not a lot of them.
> So then "smallint" is the best bet, right?
> 
> Thank you
> 
>> 2. If there are a lot of them, it's worth encoding them into a 
>> bitstring.

Hi!
If you really need 1-byte integer, you can use "char" type. Cast it 
to/from int.
See comment at the end of the page 
https://www.postgresql.org/docs/17/datatype-character.html

-- 
Best regards,

Vladlen Popolitov.