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ORA-00920: Invalid relational operator
What it means
A WHERE/ON condition has an incomplete or unsupported comparison, for example a missing operator, "= =", or a boolean expression used where Oracle SQL expects a comparison (before 23ai SQL has no BOOLEAN conditions such as WHERE flag).
How to fix it
Write a full comparison: WHERE flag = 'Y', WHERE x IS NULL, WHERE a BETWEEN b AND c. Check for a stray character between operands.
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.