Обсуждение: Creating a column interger with default to not null

I am confused with what this is telling me.
I have a table and I am trying to add a new column with constraint not null.


What am I missing?
Chris


pgdb001=> alter table schema.table add COLUMN column_name integer not null;
ERROR:  column "column_name" contains null values

On 24 September 2010 16:05, Chris Barnes
<compuguruchrisbarnes@hotmail.com> wrote:
>
> I am confused with what this is telling me.
> I have a table and I am trying to add a new column with constraint not null.
>
>
> What am I missing?
> Chris
>
>
> pgdb001=> alter table schema.table add COLUMN column_name integer not null;
> ERROR:  column "column_name" contains null values

What it's telling you is that the column can't contain null values,
but you're adding a new column with no default, so it will naturally
use null.

Try adding a default like:

ALTER TABLE schema.table ADD COLUMN column_name integer NOT NULL DEFAULT 0;

--
Thom Brown
Twitter: @darkixion
IRC (freenode): dark_ixion
Registered Linux user: #516935

On Friday 24 September 2010 8:05:43 am Chris Barnes wrote:
> I am confused with what this is telling me.
> I have a table and I am trying to add a new column with constraint not
> null.
>
>
> What am I missing?
> Chris
>
>
> pgdb001=> alter table schema.table add COLUMN column_name integer not null;
> ERROR:  column "column_name" contains null values

The error message :) The column has NULLs in it so you can not make it NOT NULL
until you get rid of them.

--
Adrian Klaver
adrian.klaver@gmail.com