Introduction to Database System
A logical schema

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

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Introduction to Database System
In a large DBMS

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

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