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ORA-00932: Inconsistent datatypes
What it means
Two expressions that must have compatible types do not: comparing a CLOB with =, using a CLOB in DISTINCT/GROUP BY/ORDER BY/UNION, mixing a number and a date, or the error says "expected X got Y".
How to fix it
Convert explicitly (TO_CHAR, TO_NUMBER, TO_DATE). For CLOBs use DBMS_LOB.COMPARE / DBMS_LOB.SUBSTR or compare a hash, and avoid CLOB columns in set operations and GROUP BY.
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.