PostgreSQL Error Troubleshooting
When PostgreSQL rejects a statement, capture the complete error message and five-character SQLSTATE. SQLSTATE codes are stable across releases and do not depend on the server’s message language. See the PostgreSQL 18 error code appendix.
PostgreSQL error triage
Choose a common SQLSTATE to get a first diagnostic step. This helper runs in your browser and does not need your SQL, schema, or database connection.
Query syntax errors
Function and routine resolution errors
Data type errors
Date and time errors
- Error 22007: invalid datetime format
- Error 22008: datetime field overflow
- Error 22009: invalid time zone displacement
Grouping errors
Query execution and cancellation errors
Transaction state errors
Transaction isolation errors
Locking and concurrency errors
Object and schema errors
- Error 42702: column reference is ambiguous
- Error 42703: column does not exist
- Error 42704: object does not exist
- Error 42P01: relation does not exist
Connection, startup, and capacity errors
- Error 08006: connection failure
- Error 28P01: password authentication failed
- Error 53300: too many connections
- Error 57P01: administrator shutdown terminated the connection
- Error 57P02: crash shutdown terminated connections
- Error 57P03: cannot connect now