How to fix the Oracle error XOQ-01941: The HierarchyLevelMap for HierarchyLevel “string” must contain a KeyExpression and a Query.?

In this post, you’ll learn more about the Oracle ErrorXOQ-01941: The HierarchyLevelMap for HierarchyLevel “string” must contain a KeyExpression and a Query. with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

XOQ-01941: The HierarchyLevelMap for HierarchyLevel “string” must contain a KeyExpression and a Query.

Reason for the Error XOQ-01941: The HierarchyLevelMap for HierarchyLevel “string” must contain a KeyExpression and a Query.

Cause: HierarchyLevelMap missing a KeyExpression, Query, or both.

How to fix the Error XOQ-01941: The HierarchyLevelMap for HierarchyLevel “string” must contain a KeyExpression and a Query. ?

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

Action: Specify a KeyExpression and Query for the HierarchyLevelMap.