Ronald Clauw

03 Jul 2015 Chaos in the library

The uniqueidentifier datatype is a 16-byte binary value used as a globally uniqueidentifier (GUID). Developers use it in database models for assigning identifiers that must be unique in a network of many computers at many sites. Also, developers exploit this uniqueidentifier data type inappropriately, assuming this is always the best way to enforce uniqueness in their data model