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What are three components of the schema architecture proposed by ANSI/SPARC?
The three component schema architecture proposed by ANSI/SPARC is as given below:
External schema: An external view is abstract representation of some portion of total database.
Conceptual schema: A conceptual view is the logical representation of the database in its entity.
Internal schema: The internal schema is database as it is physically stored.
each publisher has uniqe name a mial addrs are also kept on each pubisher.a publisher publish one book.a book publish y one publisher.book identified by isbn.each book writn by one
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