I write a lot of utility code for SQL Server. Many of the system tables include values for LoginTypeID and UserTypeID but I've never found a view in SQL Server that returns a description of each of those values.
To make it easy, in our free SDU Tools for developers and DBAs, we added two views (LoginTypes and UserTypes) to help.
You can see the views in action in the image above, and in the video here:
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