crc32c() — PostgreSQL built-in function

crc32c(): CRC-32C value. PostgreSQL miscellaneous functions — signature, volatility, version applicability and an illustrative example.

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

Summary

crc32c is a PostgreSQL built-in function in the Miscellaneous Functions group. PostgreSQL’s system catalog (pg_proc) describes it as: “CRC-32C value”.

Signature

crc32c(bytea) → bigint

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: Miscellaneous 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: bigint

Example

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

SELECT crc32c('\\x1234'::bytea);

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, crc32c first appears in PostgreSQL 18. It is present in: 18, 19.

Related & references

Reference: PostgreSQL documentation — Miscellaneous Functions.