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For side-by-side syntax and behavior across database engines, browse the cross-database SQL comparison guides.

PostgreSQL Error 42501: Permission Denied

Diagnose PostgreSQL SQLSTATE 42501 by checking the active role, schema access, table or sequence privileges, and row security.

PostgreSQL Error 42601: Syntax Error

Troubleshoot PostgreSQL SQLSTATE 42601 by reading the reported line and position, isolating the statement, and checking nearby SQL syntax.

PostgreSQL Error 42702: Column Reference Is Ambiguous

Fix PostgreSQL SQLSTATE 42702 by qualifying shared column names with table aliases and checking each table in a join.

PostgreSQL Error 42703: Column Does Not Exist

Troubleshoot PostgreSQL SQLSTATE 42703 by checking column names, table aliases, quoted identifier case, and SELECT output aliases.

PostgreSQL Error 42P01: Relation Does Not Exist

Fix PostgreSQL SQLSTATE 42P01 by checking the database, search_path, schema access, relation name, and quoted identifier case.

PostgreSQL Error 53300: Too Many Connections

Fix PostgreSQL SQLSTATE 53300 by finding available admin access, inspecting connection use, and sizing application pools against reserved slots.

PostgreSQL Error 55P03: Lock Not Available

Troubleshoot PostgreSQL SQLSTATE 55P03 by checking lock_timeout, NOWAIT clauses, and the sessions blocking a requested lock.

PostgreSQL Error 57014: Query Canceled

Troubleshoot PostgreSQL SQLSTATE 57014 by checking statement_timeout, client cancellation, lock waits, and transaction state.

PostgreSQL Error 57P01: Admin Shutdown

Troubleshoot PostgreSQL 57P01, “terminating connection due to administrator command,” by checking backend termination, shutdown, and failover events.

PostgreSQL Error 57P02: Crash Shutdown

Troubleshoot PostgreSQL 57P02, “terminating connection because of crash of another server process,” by checking crash logs and recovery.