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Introduction to Database System

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

tables
treelike structure
complex logical relationships
records

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

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

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

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

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Introduction to Database System
In SQL, which command(s) is(are) used to enable/disable a database trigger?

All of the listed here
ALTER TRIGGER
MODIFY USER
CHANGE USER

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Introduction to Database System
Which type of entity has its relationship to another entity determined by an attribute in that other entity called a discriminator?

Instance entity
Subtype entity
Supertype entity
Archetype entity

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Introduction to Database System
Which of the following is not a logical data-base structure?

relational
network
chain
tree

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