Introduction to Database System
One solution to the multivalued dependency constraint problem is to:

split the relation into two relations, each with a single theme.
create a new theme.
change the theme.
add a composite key.

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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 subschema contains every field in the logical schema
each user can access every sub¬schema
all of the listed here

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