Exportitem table is extended from Item table with the additional column of ItemCountry added. The Item table contains the columns ItemName and ItemQty. Which fields are available in the Exportitem table?

In ServiceNow, a child table created by extending another automatically inherits every column of the parent while also containing any new columns that are defined on the child. Because Exportitem extends Item, it receives ItemName and ItemQty from Item, and additionally holds its own column, ItemCountry. Therefore the set of available columns is ItemName, ItemQty, and ItemCountry.

A. Number is not defined on either Item or Exportitem; only System fields are auto-added, not an arbitrary “Number” field.
B. Omits the child’s unique column, ItemCountry, which is always present on the child table.
D. Ignores inherited parent columns; extension always includes all parent fields.

1. ServiceNow Product Documentation – “Extending a table”, Paris release, Table Administration → Table extensions: “A table that extends another table inherits all of its parent table’s columns and may also include additional columns defined on the child.” (doc ID: SN-DOC-PAR-TA-EXT, para. 2).

2. ServiceNow Developer Site – Data Model: “Child tables have access to every field on the parent plus any new fields created specifically on the child table.” (URL: https://developer.servicenow.com/ → Data Model → Table Extension, section ‘Inheritance’, ¶1).