uuid_extract_version() — PostgreSQL UUID function

uuid_extract_version(): extract version from RFC 9562 UUID. PostgreSQL uuid functions — signature, volatility, version applicability and an illustrative example.

The Sev-1 Admin
The Sev-1 Admin  ·  1 min read

Summary

uuid_extract_version is a PostgreSQL built-in function in the UUID Functions group. PostgreSQL’s system catalog (pg_proc) describes it as: “extract version from RFC 9562 UUID”.

Signature

uuid_extract_version(uuid) → smallint

Argument and return types are taken from the pg_proc catalog; internal type names are shown using their readable SQL spellings (for example int4 is shown as integer). (Derived from the catalog — see the linked reference for the canonical documentation.)

Classification

  • Category: UUID Functions
  • Kind: Function
  • Volatility: IMMUTABLE — Marked IMMUTABLE — it always returns the same result for the same arguments and can be used in indexes and other contexts that require immutability.
  • Returns: smallint

Example

Illustrative form (replace placeholder values with your own data):

SELECT uuid_extract_version(gen_random_uuid());

The example above is illustrative and is meant to show calling syntax only; consult the linked PostgreSQL documentation for exact semantics, edge cases and accepted argument combinations.

Version applicability

Based on the catalog across releases, uuid_extract_version first appears in PostgreSQL 17. It is present in: 17, 18, 19.

Related & references

Reference: PostgreSQL documentation — UUID Functions.