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Identifiers

UUID and GUID Explained: Versions 1, 4, 5 and 7, Formats and Collisions

What UUIDs and GUIDs are, how v1, v3, v4, v5 and v7 differ, why UUID v7 is now preferred for database keys, format options, collision odds, and when to use them.

Jan 2, 2026 13 min read

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