Re: How to autoincrement a primary key...

From: Thomas Kellerer <spam_eater(at)gmx(dot)net>
To: pgsql-sql(at)postgresql(dot)org
Subject: Re: How to autoincrement a primary key...
Date: 2006-09-22 22:12:00
Message-ID: ef1n3g$ra2$1@sea.gmane.org
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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('bar'));
>

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

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