From: Aarni =?iso-8859-1?q?Ruuhim=E4ki?= <aarni@kymi.com>
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To: pgsql-sql@postgresql.org
Subject: Re: How to autoincrement a primary key...
Date: Sat, 23 Sep 2006 09:27:57 +0300
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Cc: "Doug Hyde" <doug.hyde@e-cocreate.com>
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On Saturday 23 September 2006 01:12, Thomas Kellerer wrote:
> Richard Broersma Jr wrote on 22.09.2006 21:25:
> >> I am sure this is simple, but I don't get it. I am new to PGSQL, coming
> >> from MySQL - in mysql, you can autoincrement the primary key; in
> >> postgre, I am not sure how to do this. I have read the documentation,
> >> and tried "nextval" as the default - I have searched for the datatype
> >> SERIAL, but I am using navicat and this datatype is not supported. Can
> >> someone tell me how to do this - I just want the integer value for a
> >> primary key to autoincrement by one.
> >
> > CREATE TABLE bar (id    SERIAL PRIMARY KEY);
> >
> >
> > Is just shorthand notation for:
> >
> > CREATE SEQUENCE foo START 1;
> > CREATE TABLE bar (id integer PRIMARY KEY DEFAULT nextval('foo'));
>
> Well the shorthand notation has a minor gotcha: you cannot drop the
> sequence that has been created automatically. Only if you drop the column
> itself. Should not be a problem, but it is a difference between a SERIAL
> PRIMARY KEY definition and the "verbose" mode
>
> Thomas
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 9: In versions below 8.0, the planner will ignore your desire to
>        choose an index scan if your joining column's datatypes do not
>        match

Verbosily you can have even more control over the sequence.

With SERIAL the default is something like

CREATE SEQUENCE foo
    INCREMENT BY 1
    NO MAXVALUE
    NO MINVALUE
    CACHE 1;

By hand you can define e.g.

CREATE SEQUENCE foo
    START n
    INCREMENT BY n
    MAXVALUE n
    MINVALUE n
    CACHE 1;

BR,

Aarni
=2D-=20
Aarni Ruuhim=E4ki

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