How to fix the Oracle error ORA-30370: set operators are not supported in this context?

In this post, you’ll learn more about the Oracle ErrorORA-30370: set operators are not supported in this context with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-30370: set operators are not supported in this context

Reason for the Error ORA-30370: set operators are not supported in this context

A set operator such as UNION, UNION ALL, INTERSECT, or MINUS was encountered in an unsupported context, such as in a materialized view definition.

How to fix the Error ORA-30370: set operators are not supported in this context ?

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

Re-specify the expression to avoid the use of set operators.