PostgreSQL Error Reference

Every error, explained

SQLSTATE codes, condition names, root causes, diagnostic queries, and recovery steps — structured for engineers running PostgreSQL in production.

578 errors documentedFree diagnostics on every pageAll PG versions covered

Showing 336 of 578 errors

42601 ERROR

cannot insert multiple commands into a prepared statement — 42601

syntax_error

PostgreSQL error "cannot insert multiple commands into a prepared statement" (SQLSTATE 42601): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42601 ERROR

query has no destination for result data — 42601

syntax_error

PostgreSQL error "query has no destination for result data" (SQLSTATE 42601): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42601 ERROR

Syntax Error — SQLSTATE 42601

syntax_error

The SQL statement is malformed.

Syntax Error or Access Rule Violation
42602 ERROR

Invalid Name — SQLSTATE 42602

invalid_name

SQLSTATE 42602 (invalid_name): The SQL is malformed or references a missing object or privilege.

Syntax Error or Access Rule Violation
42611 ERROR

Invalid Column Definition — SQLSTATE 42611

invalid_column_definition

SQLSTATE 42611 (invalid_column_definition): The SQL is malformed or references a missing object or privilege.

Syntax Error or Access Rule Violation
42622 ERROR

Name Too Long — SQLSTATE 42622

name_too_long

SQLSTATE 42622 (name_too_long): The SQL is malformed or references a missing object or privilege.

Syntax Error or Access Rule Violation
42701 ERROR

column “…” specified more than once — 42701

duplicate_column

PostgreSQL error "column "…" specified more than once" (SQLSTATE 42701): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42701 ERROR

Duplicate Column — SQLSTATE 42701

duplicate_column

A column name is defined more than once.

Syntax Error or Access Rule Violation
42701 ERROR

column “…” of relation “…” already exists — 42701

duplicate_column

PostgreSQL error "column "…" of relation "…" already exists" (SQLSTATE 42701): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42702 ERROR

column reference “…” is ambiguous — 42702

ambiguous_column

PostgreSQL error "column reference "…" is ambiguous" (SQLSTATE 42702): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42702 ERROR

Ambiguous Column — SQLSTATE 42702

ambiguous_column

A column reference is ambiguous — it matches more than one table in the query.

Syntax Error or Access Rule Violation
42703 ERROR

column “…” referenced in foreign key constraint does not exist — 42703

undefined_column

PostgreSQL error "column "…" referenced in foreign key constraint does not exist" (SQLSTATE 42703): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42703 ERROR

column “…” does not exist — 42703

undefined_column

PostgreSQL error "column "…" does not exist" (SQLSTATE 42703): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42703 ERROR

column “…” of relation “…” does not exist — 42703

undefined_column

PostgreSQL error "column … of relation … does not exist — 42703" (SQLSTATE 42703): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42703 ERROR

Undefined Column — SQLSTATE 42703

undefined_column

A referenced column does not exist.

Syntax Error or Access Rule Violation
42704 ERROR

unrecognized configuration parameter “…” — 42704

undefined_object

PostgreSQL error "unrecognized configuration parameter "…"" (SQLSTATE 42704): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42704 ERROR

collation “…” for encoding “…” does not exist — 42704

undefined_object

PostgreSQL error "collation "…" for encoding "…" does not exist" (SQLSTATE 42704): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42704 ERROR

role “…” does not exist — 42704

undefined_object

PostgreSQL error "role "…" does not exist" (SQLSTATE 42704): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42704 ERROR

index “…” does not exist — 42704

undefined_object

PostgreSQL error "index … does not exist — 42704" (SQLSTATE 42704): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42704 ERROR

constraint “…” of relation “…” does not exist — 42704

undefined_object

PostgreSQL error "constraint "…" of relation "…" does not exist" (SQLSTATE 42704): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42704 ERROR

trigger “…” for relation “…” does not exist — 42704

undefined_object

PostgreSQL error "trigger "…" for relation "…" does not exist" (SQLSTATE 42704): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42704 ERROR

extension “…” does not exist — 42704

undefined_object

PostgreSQL error "extension "…" does not exist" (SQLSTATE 42704): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42704 ERROR

language “…” does not exist — 42704

undefined_object

PostgreSQL error "language "…" does not exist" (SQLSTATE 42704): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation
42704 ERROR

tablespace “…” does not exist — 42704

undefined_object

PostgreSQL error "tablespace "…" does not exist" (SQLSTATE 42704): what it means, common causes, and how to fix it.

Syntax Error or Access Rule Violation