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Introduction to Database System

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

IDMS
R:base
dBase-II
DB2

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Introduction to Database System
In SQL, the CREATE VIEW command is used

to define a view of one or more tables or views
to recompile a table
to recompile view
to create a trigger

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

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Introduction to Database System
Entities use identifiers while tables use keys.

False
True

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Introduction to Database System
A database is called "self-describing" because it contains a description of itself.

True
False

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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.

False
True

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