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Introduction to Database System

Introduction to Database System
Which of the following is not a relational database?

4th Dimension
FoxPro
Reflex
dBASE IV

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Introduction to Database System
In SQL, which command is used to make permanent changes made by statements issue since the beginning of a transaction?

COMMIT
ZIP
SAVE
PACK

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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
Which type of entity is related to two or more associated entities that each contain specialized attributes that apply to some but not all of the instances of the entity?

Instance entity
Subtype entity
Supertype entity
Archetype entity

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Introduction to Database System
An on-line commercial site such as Amazon.com is an example of a(n) ________ .

single-user database application
data mining database application
multiuser database application
e-commerce database application

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Introduction to Database System
In a relation, the columns are sometimes called "attributes".

False
True

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