Introduction to Database System
In a large DBMS

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

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Introduction to Database System
A multiple-form file management system

both (a) and (b)
allow you to entry data in all the forms
lets you create a look-up form with an associated read-only password to prevent access by unauthorized users
None of these
lets you define different forms for different operations

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