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Introduction to Database System

Introduction to Database System
Entity instances are associated by relationship classes.

True
False

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Introduction to Database System
The PROJECT command will create new table that has

more fields than the original table
more rows than the original table
none of the listed here
both of the listed here

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Introduction to Database System
A scheme describes

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

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Introduction to Database System
If you want to organize a file in multiple ways, it is better to _____ the data rather than to sort it.

Sort Key
Update
None of these
Delete
Index

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Introduction to Database System
The main idea behind computer files is that it is convenient to

access them
create them
store information together
arrange them

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Introduction to Database System
A key is a group of one or more attributes that uniquely identifies a row.

False
True

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