0P000ERRORTier 2 — Caution✅ HIGH confidence

invalid role specification

Category: Invalid Role SpecificationVersions: All Postgres versions

What this means

SQLSTATE 0P000 is raised when a role name specified in a command does not exist in the database cluster. This commonly occurs in GRANT, REVOKE, ALTER, SET ROLE, or connection parameters.

Why it happens

1GRANT or REVOKE specifying a role name that does not exist
2SET ROLE to a role the current session user is not a member of
3CREATE TABLE ... OWNER specifying a non-existent role

How to reproduce

Granting privileges to a role that does not exist.

trigger — this will ERROR

GRANT SELECT ON employees TO nonexistent_role;

ERROR: role "nonexistent_role" does not exist

Fix 1: Create the role before referencing it

When the role is new and has not been created yet.

fix

CREATE ROLE analyst;
GRANT SELECT ON employees TO analyst;

Why this works

Creating the role first ensures it exists in pg_roles before privilege commands reference it.

Fix 2: List existing roles to confirm the correct name

When a typo or naming convention mismatch is suspected.

fix

SELECT rolname FROM pg_roles ORDER BY rolname;

Why this works

Querying pg_roles shows all roles in the cluster; use the exact name in subsequent GRANT commands.

Sources

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

🔧 Source ref: Class 0P — Invalid Role Specification

Confidence assessment

✅ HIGH confidence

Standard SQLSTATE. Behaviour consistent across all versions.