Обсуждение: Auto increment

When creating a table how do you make an auto incrementing field? I'm
using:

Create table hosts (
    id int not null unique primary key,
    ip char(16),
    hostname text
);

Is there a way to make the host.id field automagicaly increment?

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Am Die, 2003-05-27 um 19.37 schrieb Fontenot, Paul:
> When creating a table how do you make an auto incrementing field? I'm
> using:
>
> Create table hosts (
>     id int not null unique primary key,
>     ip char(16),
>     hostname text
> );
>
> Is there a way to make the host.id field automagicaly increment?

id SERIAL PRIMARY KEY

will be translated into int with auto value automatically

P.S.: Primary Keys are automatically not null

HTH
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On Tuesday 27 May 2003 10:37 am, Fontenot, Paul wrote:
> When creating a table how do you make an auto incrementing field? I'm
> using:
>
> Create table hosts (
>     id int not null unique primary key,
>     ip char(16),
>     hostname text
> );
>
> Is there a way to make the host.id field automagicaly increment?
>
>  ***PRIVILEGED & CONFIDENTIAL***
> Unless expressly stated otherwise, this message (and any attachment(s)
> thereto) is confidential and may be privileged. It is intended for the
> addressee(s) only. If you are not an addressee, any disclosure or
> copying of the contents of this e-mail or any action taken (or not
> taken) in reliance on it is strictly prohibited. If you are not an
> addressee, please inform sender immediately and delete this message from
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use the 'serial' field type.

e.g.

create table hosts (
   id serial,
   ip char(16),
   hostname text
);

insert into hosts (ip,hostname) values ('127.0.0.1','localhost');

-doug

ps - you also might want to use 'cidr' instead of char for the ip field.

Take a look at the SERIAL data type.

http://www.postgresql.org/docs/view.php?version=7.3&idoc=0&file=datatype.htm
l

adam


> When creating a table how do you make an auto incrementing field? I'm
> using:
>
> Create table hosts (
> id int not null unique primary key,
> ip char(16),
> hostname text
> );
>
> Is there a way to make the host.id field automagicaly increment?
>
> ***PRIVILEGED & CONFIDENTIAL***
> Unless expressly stated otherwise, this message (and any attachment(s)
> thereto) is confidential and may be privileged. It is intended for the
> addressee(s) only. If you are not an addressee, any disclosure or
> copying of the contents of this e-mail or any action taken (or not
> taken) in reliance on it is strictly prohibited. If you are not an
> addressee, please inform sender immediately and delete this message from
> your system.
>
> ---------------------------(end of broadcast)---------------------------
> TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org


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create sequence(foo_sequence);

create table foo (mysequence int not null default nextval('foo_sequence'),
somedata text);

See "create sequence" for options like start value and step. Note: sequences
are used to create unique values - not to create sequences without gaps. A
sequence number grabbed in a transaction that is rolled back will leave the
sequence incremented.

Cheers,
Steve




On Tuesday 27 May 2003 10:37 am, Fontenot, Paul wrote:
> When creating a table how do you make an auto incrementing field? I'm
> using:
>
> Create table hosts (
>     id int not null unique primary key,
>     ip char(16),
>     hostname text
> );
>
> Is there a way to make the host.id field automagicaly increment?
>
>  ***PRIVILEGED & CONFIDENTIAL***
> Unless expressly stated otherwise, this message (and any attachment(s)
> thereto) is confidential and may be privileged. It is intended for the
> addressee(s) only. If you are not an addressee, any disclosure or
> copying of the contents of this e-mail or any action taken (or not
> taken) in reliance on it is strictly prohibited. If you are not an
> addressee, please inform sender immediately and delete this message from
> your system.
>
> ---------------------------(end of broadcast)---------------------------
> TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org