When a new table is created inServiceNowby extending another table, it followstable inheritanceprinciples. This means the newly created table (child table) receives all the fields from its parent table. Additionally, the new table can includecustom fieldsthat are unique to itself.
Here’s how inheritance works in ServiceNow when a table is extended:
Fields Inheritance:
The child table automatically inherits all fields from its parent table.
These inherited fieldscannot be removedfrom the child table but can be modified or overridden.
The child table can also have additionalcustom fieldsthat do not exist in the parent table.
Business Rules, Client Scripts, and UI Policies:
Unlike fields, these components arenot automatically inherited.
However, they can still affect the child tableif they are defined on the parent table using conditions that include the child table.
To apply them specifically to the child table, they need to beexplicitly definedfor the new table.
Access Control Rules (ACLs):
ACLs are not automatically inherited.
Each table in ServiceNow has its own set ofAccess Control Rules, which must be explicitly configured for the child table if different permissions are required.
Database Structure:
The child table creates aone-to-one relationshipwith the parent table, meaningall fields in the parent are available in the child table.
The new table is stored as a separate entity but references the parent table’s structure.
The child tableinherits all fieldsfrom the parent table.
The child table can also have its owncustom fields.
Business Rules, Client Scripts, UI Policies, and ACLs arenot automatically inherited, meaning options B and D are incorrect.
The tabledoes not archivethe parent table (making option A incorrect).
ServiceNow Product Documentation – Table Inheritance:https://docs.servicenow.com
ServiceNow Fundamentals – Table Relationships
ServiceNow Developer Portal – Extending Tables
ServiceNow Best Practices – Access Controls & Security Rules
Why Option C is Correct?References from Certified System Administrator (CSA) Documentation:
