The Problem table is extended from what table?

Outage [cmdb_ci_outage] is a separate CMDB-related table and is not in the Problem inheritance chain.

Problem Task [problem_task] extends Problem, making it a child of Problem, not the other way around.

In ServiceNow's table inheritance model, the Problem table directly extends the Task [task] table, which is the common parent for all work-item tables including Incident, Change, and Problem. This inheritance provides Problem records with shared fields like number, state, assigned_to, and short_description from a single source of truth.

Major Incident is a state or view within the Incident table, not a table that Problem inherits from.

Incident also extends Task, making it a sibling of Problem in the hierarchy, not a parent.