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Introduction to Database System

Introduction to Database System
Large collections of files are called

None of these
databases
file system
fields
records

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

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

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Introduction to Database System
A minimum cardinality is the minimum number of entity instances that may participate in a relationship instance.

False
True

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Introduction to Database System
A scheme describes

records and files
record relationships
None of these
All of these
data elements

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Introduction to Database System
Data encryption techniques are particularly useful for

None of these
improving data integrity
protecting data in data communication systems
All of these
reducing storage space requirements

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Introduction to Database System
The functional dependency R → S means that the value of S can be determined when we are given a value of R.

True
False

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