Re: Altering a table in Postgres to add a NOT NULL constraint

Hi, Jason.

On Wed, 2002-05-22 at 20:54, Jason Cernansky wrote:
> The following statement should allow you to add a not null constraint to
> a table:
>
> ALTER TABLE tablename ADD CONSTRAINT notnullchk CHECK (columnname IS NOT
> NULL);

Thanks for showing me how to prevent NULLs.  Unfortunately,
that command is a column-level CHECK constraint, not a NOT
NULL constraint needed by ALTER TABLE ... PRIMARY KEY.

How do I know?  I tried it...

So, I now have to reload the table...

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