Class 00 — Successful Completion
Class 01 — Warning
Class 02 — No Data (this is also a warning class per the SQL standard)
Class 03 — SQL Statement Not Yet Complete
Class 08 — Connection Exception
Class 09 — Triggered Action Exception
Class 0A — Feature Not Supported
Class 0B — Invalid Transaction Initiation
Class 0F — Locator Exception
Class 0L — Invalid Grantor
Class 0P — Invalid Role Specification
Class 0Z — Diagnostics Exception
Class 20 — Case Not Found
Class 21 — Cardinality Violation
Class 22 — Data Exception
Class 23 — Integrity Constraint Violation
Class 24 — Invalid Cursor State
Class 25 — Invalid Transaction State
Class 26 — Invalid SQL Statement Name
Class 27 — Triggered Data Change Violation
Class 28 — Invalid Authorization Specification
Class 2B — Dependent Privilege Descriptors Still Exist
Class 2D — Invalid Transaction Termination
Class 2F — SQL Routine Exception
Class 34 — Invalid Cursor Name
Class 38 — External Routine Exception
Class 39 — External Routine Invocation Exception
Class 3B — Savepoint Exception
Class 3D — Invalid Catalog Name
Class 3F — Invalid Schema Name
Class 40 — Transaction Rollback
Class 42 — Syntax Error or Access Rule Violation
Class 44 — WITH CHECK OPTION Violation
Class 53 — Insufficient Resources
Class 54 — Program Limit Exceeded
Class 55 — Object Not In Prerequisite State
Class 57 — Operator Intervention
Class 58 — System Error (errors external to PostgreSQL itself)
Class 72 — Snapshot Failure
Class F0 — Configuration File Error
Class HV — Foreign Data Wrapper Error (SQL/MED)
Class P0 — PL/pgSQL Error
Class XX — Internal Error