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Combining fields to make a unique record or keeping them separated

I've been asked to implement what has before, been a bunch of CSV files, into a MySQL database. I'm at a point in the design where all the schemas, tables and fields have been mocked-up; however I'm ...
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Best data type to store Active Directory Nullable GUID

I have a table name Employees,inside Sql Server 2008 r2. the table contain the following columns:- UserID. it is the Primary key, and it is auto generated by the DB. GUID. which will store the ...