UUID generating gen_random_uuid uuidv4 uuidv7 uuid_extract_timestamp uuid_extract_version shows the PostgreSQL functions that can be used to generate UUIDs. Function Description Example(s) gen_random_uuid uuid uuidv4 uuid Generate a version 4 (random) UUID. gen_random_uuid() 5b30857f-0bfa-48b5-ac0b-5c64e28078d1 uuidv4() b42410ee-132f-42ee-9e4f-09a6485c95b8 uuidv7 ( shift interval ) uuid Generate a version 7 (time-ordered) UUID. The timestamp is computed using UNIX timestamp with millisecond precision + sub-millisecond timestamp + random. The optional parameter shift will shift the computed timestamp by the given interval. uuidv7() 019535d9-3df7-79fb-b466-fa907fa17f9e The module provides additional functions that implement other standard algorithms for generating UUIDs. shows the PostgreSQL functions that can be used to extract information from UUIDs. Function Description Example(s) uuid_extract_timestamp ( uuid ) timestamp with time zone Extracts a timestamp with time zone from UUID version 1 and 7. For other versions, this function returns null. Note that the extracted timestamp is not necessarily exactly equal to the time the UUID was generated; this depends on the implementation that generated the UUID. uuid_extract_timestamp('019535d9-3df7-79fb-b466-&zwsp;fa907fa17f9e'::uuid) 2025-02-23 21:46:24.503-05 uuid_extract_version ( uuid ) smallint Extracts the version from a UUID of the variant described by RFC 9562. For other variants, this function returns null. For example, for a UUID generated by gen_random_uuid, this function will return 4. uuid_extract_version('41db1265-8bc1-4ab3-992f-&zwsp;885799a4af1d'::uuid) 4 uuid_extract_version('019535d9-3df7-79fb-b466-&zwsp;fa907fa17f9e'::uuid) 7 PostgreSQL also provides the usual comparison operators shown in for UUIDs. See for details on the data type uuid in PostgreSQL.