oops sorry!
i too feel the same.
> Rajesh Kumar Mallah <mallah@trade-india.com> writes:
>> If a feild is already NOT NULL
>> setting it not null with ALTER command
>> does not issues any warning.
>
> Why should it? Updating a field to the same value it already has
> doesn't ordinarily issue a warning in SQL ...
>
> regards, tom lane
>
>
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