unicode_assigned() — PostgreSQL mathematical function

unicode_assigned(): check valid Unicode. PostgreSQL mathematical functions — signature, volatility, version applicability and an illustrative example.

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

Summary

unicode_assigned is a PostgreSQL built-in function in the Mathematical Functions group. PostgreSQL’s system catalog (pg_proc) describes it as: “check valid Unicode”.

Signature

unicode_assigned(text) → boolean

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: Mathematical 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: boolean

Example

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

SELECT unicode_assigned('abc');

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, unicode_assigned first appears in PostgreSQL 17. It is present in: 17, 18, 19.

Related & references

Reference: PostgreSQL documentation — Mathematical Functions.