0A000ERRORTier 1 — Safe✅ HIGH confidence

feature not supported

Category: Feature Not SupportedVersions: All Postgres versions

What this means

The SQL statement or option requested is not supported by this version of Postgres or in the current context (e.g., inside a trigger, on a partitioned table, or with an incompatible column type).

Why it happens

1Using a SQL feature not yet implemented in the current Postgres version
2Using a DDL option on a partitioned table that is not supported for partitioned tables
3Attempting to create a DEFERRABLE constraint type that Postgres does not support as deferrable
4Calling a function or using a syntax that requires a loaded extension that is not installed
5Using RETURNING with a non-updatable view

How to reproduce

A user attempts a feature that Postgres does not support in the given context.

trigger — this will ERROR

-- Example: cannot use RETURNING with a view that is not auto-updatable
CREATE VIEW active_users AS SELECT * FROM users WHERE active = true;

-- Attempt RETURNING on an updatable view with a DISTINCT (makes it non-updatable):
CREATE VIEW unique_emails AS SELECT DISTINCT email FROM users;
INSERT INTO unique_emails (email) VALUES ('x@x.com'); -- triggers 0A000

ERROR: cannot insert into view "unique_emails" DETAIL: Views containing DISTINCT are not automatically updatable.

Fix 1: Use an INSTEAD OF trigger to make the view updatable

When the view is intentionally complex and you need INSERT/UPDATE/DELETE support.

fix

CREATE OR REPLACE FUNCTION unique_emails_insert()
RETURNS TRIGGER LANGUAGE plpgsql AS $
BEGIN
  INSERT INTO users (email) VALUES (NEW.email)
  ON CONFLICT (email) DO NOTHING;
  RETURN NEW;
END;
$;

CREATE TRIGGER trg_unique_emails_insert
  INSTEAD OF INSERT ON unique_emails
  FOR EACH ROW EXECUTE FUNCTION unique_emails_insert();

Why this works

INSTEAD OF triggers intercept DML on a view before it reaches the view resolution code. The trigger body runs instead of the default action, allowing arbitrary logic to translate the view-level operation into table-level operations that Postgres can execute.

Fix 2: Upgrade Postgres to access a newer feature

When the feature genuinely did not exist in the installed version.

fix

-- Check current version:
SELECT version();
-- Then refer to the Postgres release notes for the target feature's version requirement.

Why this works

Each Postgres major release adds new SQL features. If the feature is absent in the current version, upgrading is the only path. pg_upgrade can perform major version upgrades with minimal downtime using the --link option on supported platforms.

What not to do

✗

Ignore 0A000 and implement the logic entirely in application code

Why it's wrong: Moves correctness guarantees out of the database where they can be bypassed; keep business rules in the database when possible.

Sources

📚 Official docs: https://www.postgresql.org/docs/current/errcodes-appendix.html

📚 Feature docs: https://www.postgresql.org/docs/current/sql-createview.html#SQL-CREATEVIEW-UPDATABLE-VIEWS

📖 Further reading: Updatable Views

Confidence assessment

✅ HIGH confidence

The error code is stable but the triggering scenarios are wide and version-dependent. The INSTEAD OF trigger fix is universally applicable for view DML. Confidence on specific feature availability is MEDIUM because it requires checking the version release notes.