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Introduction to Database System

Introduction to Database System
Which of the following products implemented the CODASYL DBTG model?

IDMS
R:base
dBase-II
DB2

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Introduction to Database System
Which type of entity represents an actual occurrence of an associated generalized entity?

Archetype entity
Instance entity
Supertype entity
Subtype entity

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Introduction to Database System
What software packages are commonly used for businesses that have to track extensive lists of clients and inventory?

Special purpose packages
None of these
Custom made programs
Single function application packages
Data management packages

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Introduction to Database System
A compound key

both (a) and (b)
uniquely identifies an item in a list
is made up a several pieces of information
is a combination of each unique key
None of these

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Introduction to Database System
A functional dependency is a relationship between or among attributes.

False
True

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Introduction to Database System
The purpose of a database is to help people stop using spreadsheets.

False
True

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