A special case where UUID keys are extremely helpful is when you have to convert your data from one system to another - customer "105" can be different in diffe

A special case where UUID keys are extremely helpful is when you have to convert your data from one system to another - customer "105" can be different in different databases, but customer "7C823BE3-CB5B-4E34-BE8D-4B5A71945D3F" is truly unique. This takes dealing with foreign keys from "nightmare" to "non-issue".