I had Visual Studio 2010 Premium and SSDT for VS 2010. Now I have upgraded my VS to 2012 as well as my SSDT. Now I am not able to open the db projects I created in the previous version. I get the error "This version of SQL Server data tools is not compatible
with the database runtime components installed on this computer". How can I open the db projects I created in VS 2010?
You need to upgrade both SSDT for VS2010 and SSDT for VS2012 to the latest version -
available here. Both versions share the same database runtime components so you need to keep them in sync when you are running side by side on the same machine.