jsonb_object_agg_unique() — PostgreSQL aggregate aggregate function

jsonb_object_agg_unique(): aggregate inputs into jsonb object checking key uniqueness. PostgreSQL aggregate functions — signature, volatility, version applicability and an illustrative example.

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

Summary

jsonb_object_agg_unique is a PostgreSQL built-in aggregate function in the Aggregate Functions group. PostgreSQL’s system catalog (pg_proc) describes it as: “aggregate inputs into jsonb object checking key uniqueness”.

Signature

jsonb_object_agg_unique(any, any) → jsonb

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: Aggregate Functions
  • Kind: Aggregate 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: jsonb

Example

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

SELECT jsonb_object_agg_unique(col) FROM your_table;

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, jsonb_object_agg_unique first appears in PostgreSQL 16. It is present in: 16.

Related & references

Reference: PostgreSQL documentation — Aggregate Functions.