Introduction to Database System
A logical schema

None of these
is the entire database
All of these
describes how data is actually stored on disk
is a standard way of organizing information into accessible parts

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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
None of these
lets you define different forms for different operations
lets you create a look-up form with an associated read-only password to prevent access by unauthorized users

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