Re: [SQL] Database views metadata always nullable columns

basuraspam - <basuraspam0@gmail.com> writes:
>    Doing some automatic metadata parsing job against postgresql schema I
> just find that database views always shown all its column as nullable, it
> doesn't matter what are the constraints in the original table columns used
> as source to create the view.
> I just checked it against infomation_schema and pg_attribute with the same
> result.

regression=# create table foo (f1 int, f2 int not null);
CREATE TABLE
regression=# select column_name, is_nullable from information_schema.columns where table_name = 'foo';
 column_name | is_nullable
-------------+-------------
 f1          | YES
 f2          | NO
(2 rows)

regression=# select attname,attnotnull from pg_attribute where attrelid = 'foo'::regclass and attnum > 0;
 attname | attnotnull
---------+------------
 f1      | f
 f2      | t
(2 rows)

So I don't see anything particularly broken here.  Maybe you should
provide some concrete examples rather than making sweeping claims.

                        regards, tom lane