I’m in the process of doing this for a project that uses Microsoft SQL Server. One of the “gotchas” I came across was that once you’ve switched from “int” to “uniqueidentifier”, @@IDENTITY and SCOPE_IDENTITY references won’t work. The second response in this thread pointed me in the right direction. You have to call NEWID() in the context where you need it (and save the value) in order to be able to refer to it later.