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Introduction to Database System

Introduction to Database System
Which of the following is NOT a basic element of all versions of the E-R model?

Relationships
Primary keys
Attributes
Entities

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Introduction to Database System
In SQL, which of the following is not a data Manipulation Language Commands?

DELETE
UPDATE
CREATE
SELECT

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Introduction to Database System
An audit trail

All of the listed here
is the recorded history of operations performed on a file
can be used to restore lost information
is used to make back-up copies

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Introduction to Database System
In SQL, which command is used to select only one copy of each set of duplicable rows

SELECT DISTINCT
SELECT DIFFERENT
SELECT UNIQUE
All of these
None of these

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

True
False

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Introduction to Database System
If a piece of data is stored in two places in the database, then

it can be more easily accessed
changing the data is one spot will cause data inconsistency
None of these
storage space is wasted
both (a) and (b)

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