Raise Exception — SQLSTATE P0001

SQLSTATE P0001 condition raise_exception class P0 — PL/pgSQL Error severity ERROR
Reproduced & verified on PostgreSQL 14.23, 15.18, 16.14, 17.10 and 18.4 — identical message on every version.
Last reviewed 29 May 2025 · Reproduced live with the SQL on this page.

! Symptoms Free

A user-defined exception was raised by RAISE EXCEPTION.

  • The error is written to the server log and returned to the client carrying SQLSTATE P0001.
  • Any driver (libpq, JDBC, psycopg, npgsql, pgx) surfaces this code in its error object so you can branch on it programmatically.
  • PL/pgSQL can trap it by name: EXCEPTION WHEN raise_exception THEN.

1 Environment & reproduce Free

Severity: ERROR  |  PostgreSQL versions: 12, 13, 14, 15, 16, 17

Reproduce with the exact statement and read the full message in the server log (raise log_min_messages / set log_min_error_statement for more context).

? Root cause Free

PL/pgSQL code explicitly raised this with RAISE EXCEPTION — it is application business logic, not a database fault.

3 Recovery & verify Free

Steps to resolve P0001:

  1. Read the custom message and hint — they describe the rule that fired.
  2. Handle it where appropriate: EXCEPTION WHEN raise_exception THEN ... or a custom condition name.

Reference: PostgreSQL error codes — Class P0 (PL/pgSQL Error).