EC
0A000
PostgreSQLERRORCommonFeature Not SupportedHIGH confidence

feature not supported

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

expected output

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

Use an INSTEAD OF trigger to make the view updatable
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 When the feature genuinely did not exist in the installed version.

Upgrade Postgres to access a newer feature
-- 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

Moves correctness guarantees out of the database where they can be bypassed; keep business rules in the database when possible.

Content generated with AI assistance and reviewed for accuracy. Found an error? hello@errcodes.dev

← All PostgreSQL errors