All errors › ORA errors
ORA-01422: Exact fetch returns more than requested number of rows
What it means
A SELECT ... INTO returned more than one row (TOO_MANY_ROWS).
How to fix it
Make the WHERE clause unique (use the key), aggregate, add FETCH FIRST 1 ROW ONLY / ROWNUM = 1 if any row is acceptable, or use BULK COLLECT into a collection.
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.