I have a query that inserts using a select:
INSERT INTO courses (name, location, gid) SELECT name, location, gid FROM courses
Yes, absolutely, but check your syntax.
INSERT INTO courses (name, location, gid) SELECT name, location, 1 FROM courses WHERE cid = 2
You can put a constant of the same type as gid in its place, not just 1, of course. And, I just made up the cid value.
gid
cid