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Question

What is a Subschema in the context of a database?

a.

A collection of internal database views

b.

A collection of external user views of a database

c.

A method for database schema changes

d.

A system for database replication

Posted under Data Warehousing and OLAP

Answer: (b).A collection of external user views of a database Explanation:A Subschema is a collection of external user views of a database.

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