There is a table t upon which a primary key constraint by the name pk is applied. What will be the correct syntax to drop the constraint?

Which of the following holds true for functions in PostgreSQL?

Can you define variables in PostgreSQL pl/pgSQL whose value cannot be null?

When should sub queries be used?

What do you call the application that makes requests of the PostgreSQL server?

With table inheritance, not null and check constraints are inherited.

The value NULL, in database terminology, means?

PostgreSQL can be used from just about any major programming language, including C, C++, Perl, Python, Java, Tcl, and PHP.