I see these two acronyms being thrown around and I was wondering if there are any differences between a GUID and a UUID?
5 Answers
GUID is Microsoft's implementation of the UUID standard.
Per Wikipedia:
The term GUID usually refers to Microsoft's implementation of the Universally Unique Identifier (UUID) standard.
An updated quote from that same Wikipedia article:
RFC 4122 itself states that UUIDs "are also known as GUIDs". All this suggests that "GUID", while originally referring to a variant of UUID used by Microsoft, has become simply an alternative name for UUID…
Not really. GUID is more Microsoft-centric whereas UUID is used more widely (e.g., as in the urn:uuid: URN scheme, and in CORBA).
One difference between GUID in SQL Server and UUID in PostgreSQL is letter case; SQL Server outputs upper while PostgreSQL outputs lower.
The hexadecimal values "a" through "f" are output as lower case characters and are case insensitive on input. - rfc4122#section-3
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