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Universally unique identifiers (UUIDs) are 128-bit numbers that are accepted as being unique on the local system they are created on as well as among the UUIDs created on other systems in the past as well as the future. Because of their uniqueness, they can be created on both the client and server and come in really handy in situations where an auto incremented primary key can fall short. Because of their uniqueness, UUIDs are well suited for generating test data. Need a random string? A UUID is...