create table aaa(field1 .... not null,field2 ....,....,primary key (field1, field2)
);
Based on the above table definition, field2 allows null values. But
after the table created based on the above script, field2 becomes not
null. The only conclusion I come up with is setting the field as part of
the primary key, PostgreSQL automatically sets the field to not null. Or
is it something else?
Is this a feature or bug?
