Re: Is this a buggy behavior?

Am 24.03.24 um 16:28 schrieb Thiemo Kellner:
>
> Am 24.03.2024 um 16:17 schrieb Tom Lane:
>
>> To do that, we'd have to remember that you'd said NULL, which we
>> don't: the word is just discarded as a noise clause. Considering
>> that this usage of NULL isn't even permitted by the SQL standard,
>> that seems like a bit too much work.
>
> If I understood correctly, only the NOT NULL expression gets 
> remembered, but the NULL gets discarded. No, I do not quite get it. 
> Somehow, it has to be decided whether to create a "check constraint" 
> or not, but this information is not available any more when creating 
> the primary key? Not even in some kind of intermediary catalogue?

the null-able constraint addition to a column is pointless because by 
default all columns are nullable. definition as a primary key adds the 
not null constraint.

Andreas

-- 
Andreas Kretschmer
CYBERTEC PostgreSQL Services and Support