Visual studio database edition is part of the "normal" Visual studio. One cannot be totally sure of this since Microsofts licences are as comprehensible as scientology.
I made two tries at it before I got it to work. Then it failed me anyway, but that is another posting.
The way to think is to think about the database as source code. You make changes, compare them to the checked in/commited code and let the machine do its magic merge and check in the result.