PostgreSQL 0A000 feature_not_supported: unsupported SQL feature

Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.

1. 1

   Capture the verbose Message, Detail, Hint, and cursor Position fields from ErrorResponse

   Tools required

   Who:

   You or your developer inspect the full error output from the rejected SQL command.

   How:

   Run `\set VERBOSITY verbose` in `psql` (or inspect protocol fields `C`, `M`, `D`, `H`, and `P` in your client driver) when reproducing the statement in a non-destructive session.

   Result that matters:

   Because `0A000` is the single code in Class 0A, the human-readable `Message` (`M`), `Detail` (`D`), `Hint` (`H`), and character `Position` (`P`) specify which clause or object type was rejected.

   If `M` or `D` names a specific unsupported combination (such as subqueries in `CHECK` or a foreign key between temporary and permanent tables), that confirms the SQL construct itself is disallowed regardless of retries.

   If `P` points to a specific keyword index in the query string, that isolates the exact clause that must be rewritten.

   Evidence to keep:

   Keep the verbatim `C`, `M`, `D`, `H`, and `P` fields along with the failed SQL text.

   Do not re-run DDL or write statements blindly on production; capture the verbose fields and `ROLLBACK` any open transaction block.

   Evidence: PostgreSQL 18 Appendix A: Error Codes · PostgreSQL error and notice fields · PostgreSQL bug reporting guidelines

2. 2

   Verify the connected server version with SELECT version() or SHOW server_version

   Tools required

   Who:

   Your developer or DBA checks the exact PostgreSQL release on the target connection.

   How:

   Execute `SELECT version();`, `SHOW server_version;`, or `SELECT current_setting('server_version_num');` on the same database connection that returned `0A000`.

   Result that matters:

   `SHOW server_version` and `version()` report the running server's version number, and `server_version_num` provides a machine-readable integer for version comparisons.

   If the connected server is an older major release than the documentation your query was written for, that confirms a version mismatch between the application query and the target cluster.

   If the server is already on the current release (such as PostgreSQL 18.6) and the manual states the construct is not supported, that rules out a version gap and confirms an architectural limitation of PostgreSQL.

   Evidence to keep:

   Record the exact output of `SELECT version();` and `SHOW server_version;`.

   Run read-only version inquiries only; never attempt an unplanned in-place server upgrade on production without a tested backup and maintenance window.

   Evidence: PostgreSQL bug reporting guidelines · PostgreSQL 18 SHOW · PostgreSQL 18 system information functions

3. 3

   Check the official command reference for documented alternatives to the rejected clause

   No special tools

   Who:

   Your developer compares the rejected statement against the `CREATE TABLE`, `SET CONSTRAINTS`, or relevant SQL command reference page.

   How:

   Look up the rejected clause in the PostgreSQL manual for your server version to see whether a documented alternative exists (for example, using a custom trigger instead of a cross-row `CHECK` constraint, or `MATCH SIMPLE` / `MATCH FULL` instead of `MATCH PARTIAL`).

   Result that matters:

   Section 5.1 of the Bug Reporting Guidelines advises reading the documentation to verify whether a construct is supported, as failing to comply with every optional SQL standard feature is not a server bug.

   If the manual documents an alternative mechanism (such as a trigger, `UNIQUE`, `EXCLUDE`, or `FOREIGN KEY` instead of a cross-row `CHECK`), that confirms the supported design path.

   If the feature is only available in a newer major version, that indicates you must either rewrite the query for the current version or schedule a tested major-version upgrade.

   Evidence to keep:

   Save the exact documentation section citation and the rewritten SQL statement.

   Evidence: PostgreSQL constraints · PostgreSQL bug reporting guidelines · PostgreSQL 18 CREATE TABLE

A code is meaningful only inside the right product and version context.

Appendix A of the PostgreSQL documentation assigns SQLSTATE 0A000 to `feature_not_supported`, the only condition in Class 0A (Feature Not Supported) and its standard `000` class code. Because PostgreSQL emits 0A000 whenever a parsed SQL clause or combination is not implemented in that server version or context, the code alone has no single documented cause and never indicates database corruption or a server fault. Instead, the `Message` (`M`), `Detail` (`D`), `Hint` (`H`), and cursor `Position` (`P`) fields in `ErrorResponse`, together with `server_version`, identify the rejected construct (such as `MATCH PARTIAL` foreign keys, `CHECK` subqueries, or `UNLOGGED` partitioned tables).

• Mediumsource verified

  Never drop table constraints, disable triggers, or grant superuser privileges as a workaround for an `0A000` error; replace the unsupported syntax with a supported constraint or trigger instead.

  Evidence: PostgreSQL constraints · PostgreSQL 18 CREATE TABLE

• Lowsource verified

  Do not attempt to submit a bug report or support log containing `0A000` query output before redacting passwords, connection strings, and private table data, and always include `SELECT version();` and a self-contained reproduction script.

  Evidence: PostgreSQL error and notice fields · PostgreSQL bug reporting guidelines

1. 1

   PostgreSQL 18 Appendix A: Error Codes

   PostgreSQL Global Development Group · 2026 · official_doc