Can you extend a system or database view table?

In the context of ServiceNow and its database architecture, system or database view tables are not extendable. These tables are predefined in the system to provide a read-only view of data contained in other tables, and they exist for the purpose of facilitating better data organization and retrieval. Extending a table typically involves adding new fields or creating a child table that inherits properties and relationships from a parent table; however, because system views are meant to reflect data from underlying tables without modification, they lack the capability to be extended.

This characteristic of system or database view tables is fundamental to maintaining data integrity and consistency within the application. The existence of these views allows users to interact with complex data more easily without altering the structure of the original tables. Thus, when considering these definitions and functions within ServiceNow's architecture, it is clear why extending a system or database view table is not permissible.