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Introduction to Database System

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

R:base
dBase-II
DB2
IDMS

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Introduction to Database System
A compound key

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

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Introduction to Database System
A recursive relationship is a relationship between an archetype and an instance of that archetype.

False
True

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Introduction to Database System
An ID-dependent entity is an entity whose identifier is a composite identifier where no portion of the composite identifier is an identifier of another entity.

False
True

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Introduction to Database System
A computer file can be best described as

a single data item
a random collection of data items
None of these
an orderly collection of data items
a general collection of data items

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Introduction to Database System
Row is synonymous with the term:

column.
record.
field.
relation.

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