How to fix the Oracle error ORA-22903: MULTISET expression not allowed?

In this post, you’ll learn more about the Oracle ErrorORA-22903: MULTISET expression not allowed with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-22903: MULTISET expression not allowed

Reason for the Error ORA-22903: MULTISET expression not allowed

MULTISET expressions are allowed only inside a CAST to a nested table or VARRAY type.

How to fix the Error ORA-22903: MULTISET expression not allowed ?

You can fix this error in Oracle by following the below steps

put the MULTISET(subquery) expression inside a CAST to a nested table or VARRAY type.