Since there is no add-in for SQL Source Control for Visual Studio, there is no mechanism for effectively versioning changes inside Visual Studio.

The SQL Change Automation Core (only currently available as part of VS 2017 Enterprise) provided a mechanism for maintain changes scripts that are fully integrated into VS Project (and therefore can be placed under source control as a part of the project).

This combination is Developer focused (rather than dev-ops focus of full SQL Change Automation)