Introduction to Database System
A network schema

stores data in tables
permits many-to-many relation¬ships
All of the listed here
restricts the structure to a one-to-many relationship

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Introduction to Database System
In a large DBMS

each user can "see" only a small part of the entire database
each user can access every sub¬schema
each subschema contains every field in the logical schema
all of the listed here

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