Introduction to Database System
If the record management system allows you to edit values before they are recorded on disk, you can

change the name of a field
change the width of a field
correct spelling changes before they are recorded
All of the listed here

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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
all of the listed here
each subschema contains every field in the logical schema

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