42883 function 🐘 PostgreSQL

ERROR: function x(text) does not exist — No function matches the given name and argument types

PostgreSQL found no function with that name and argument types — wrong types, missing extension, or schema not in search_path.

Seen on: PostgreSQL

Meaning

Functions are overloaded by argument types. uuid_generate_v4() needs the uuid-ossp extension; MySQL functions (IFNULL, DATE_FORMAT) don’t exist in PostgreSQL.

Common causes

  • Extension not installed (uuid-ossp, pgcrypto, postgis)
  • Argument types don’t match any overload
  • MySQL function names (IFNULL, NOW() variants, DATE_FORMAT)
  • Function in a schema not on search_path

⚡ Quick fix

  1. Install the extension: CREATE EXTENSION IF NOT EXISTS "uuid-ossp"
  2. Cast arguments
  3. Use PostgreSQL equivalents (COALESCE, to_char)
  4. Use gen_random_uuid() (built-in since PG 13)

Detailed fix by platform

PostgreSQL

  1. SELECT gen_random_uuid();

How to diagnose

  1. Function — Name and argument types
  2. Extension — Installed in this database?

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