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Introduction to Database System

Introduction to Database System
A primary key is a composite key that was selected to be the main identifier for the relation.

False
True

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Introduction to Database System
The degree of a relationship refers to the number of entity classes in the relationship.

False
True

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Introduction to Database System
The _____ command is used to allocates an extent for the table in SQL

None of these
ALTER TABLE
MODIFY TABLE
MODIFY ALLOCATES
REDEFINE TABLE

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Introduction to Database System
A report generator is used to

print files on paper
data entry
update files
all of the listed here

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Introduction to Database System
Every time attribute A appears, it is matched with the same value of attribute B, but not the same value of attribute C. Therefore, it is true that:

A →
(B,C) →
A → (B,C).
A →

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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?

SAVE
ZIP
PACK
COMMIT

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