All errors › ORA errors
ORA-02287: Sequence number not allowed here
What it means
NEXTVAL/CURRVAL used where it is forbidden: with DISTINCT, GROUP BY, ORDER BY, UNION, in a subquery or view.
How to fix it
Generate the value in an outer query or use an identity column / DEFAULT seq.NEXTVAL.
Catch it before it runs
ORA Error Helper
Explains ORA-/PLS- codes inside JetBrains IDEs and DataGrip. PL/SQL Lint
Flags risky PL/SQL patterns while you type. Oracle Plan Reader
Reads execution plans and points at the slow step. PL/SQL in Practice
Kindle book with practical PL/SQL for working developers.
Explains ORA-/PLS- codes inside JetBrains IDEs and DataGrip. PL/SQL Lint
Flags risky PL/SQL patterns while you type. Oracle Plan Reader
Reads execution plans and points at the slow step. PL/SQL in Practice
Kindle book with practical PL/SQL for working developers.
Nearby errors
Updated 2026-11-12.