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Re: [SQL] How to Convert Integer to Serial

From: venkat <ven(dot)tammineni(at)gmail(dot)com>
To: Shoaib Mir <shoaibmir(at)gmail(dot)com>
Cc: pgsql-general(at)postgresql(dot)org, pgsql-sql(at)postgresql(dot)org
Subject: Re: [SQL] How to Convert Integer to Serial
Date: 2010-10-29 05:02:10
Message-ID: AANLkTimQSj4SrgtEEngEwq4eHFr1sRi5OgVnJvUhO1s9@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-generalpgsql-sql
ohhh,, sorry... It was wrong post..sorry again...

On Fri, Oct 29, 2010 at 10:30 AM, Shoaib Mir <shoaibmir(at)gmail(dot)com> wrote:

> On Fri, Oct 29, 2010 at 3:48 PM, venkat <ven(dot)tammineni(at)gmail(dot)com> wrote:
>
>> Dear All,
>>
>>   I want to convert integer datatype to serial datatype.. is that
>> possible.Please let me know.
>>
>>
> I don't think ALTER TABLE will let you do that... so the best way to
> achieve the same is:
>
> - Create a sequence for the column (set the start of sequence according to
> the values you got already in the column)
> - Now set this sequence as the default value for that specific column which
> you need to ALTER like this:
>
> ALTER TABLE tablename ALTER COLUMN columnname
>         SET DEFAULT nextval('newsequence'::regclass);
>
> --
> Shoaib Mir
> http://shoaibmir.wordpress.com/
>

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