INF503 Week 2 Quize's

Started on	Sunday, January 23, 2022, 5:07 PM
State	Finished
Completed on	Sunday, January 23, 2022, 5:14 PM
Time taken	6 mins 17 secs
Grade	15.00 out of 20.00 (75%)

Question 1

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_____ returns only the attributes requested, in the order in which they are requested.

Select one:

DIFFERENCE

PROJECT

SELECT

Incorrect

UNION

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The correct answer is: PROJECT

Question 2

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An entity is said to be _____-dependent if it can exist in the database only when it is associated with another related entity occurrence.

Select one:

existence

Correct

data

business

relationship

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The correct answer is: existence

Question 3

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A _____ key can be described as a minimal superkey, a superkey without any unnecessary attributes.

Select one:

foreign

secondary

Incorrect

candidate

primary

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The correct answer is: candidate

Question 4

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A _____ is the primary key of one table that has been placed into another table to create a common attribute.

Select one:

composite primary key

foreign key

candidate key

superkey

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The correct answer is: foreign key

Question 5

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_____ expresses the minimum and maximum number of entity occurrences associated with one occurrence of the related entity.

Select one:

Dependence

Connectivity

Relationship

Cardinality

Correct

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The correct answer is: Cardinality

Question 6

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_____, also known as RESTRICT, yields values for all rows found in a table that satisfy a given condition.

Select one:

UNION

INTERSECT

DIFFERENCE

SELECT

Correct

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The correct answer is: SELECT

Question 7

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A _____ contains at least all of the attribute names and characteristics for each table in the system.

Select one:

data dictionary

Correct

database

logical schema

relational schema

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The correct answer is: data dictionary

Question 8

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A _____ relationship exists when three entities are associated.

Select one:

weak

ternary

Correct

unary

strong

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The correct answer is: ternary

Question 9

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A _____ is any key that uniquely identifies each row.

Select one:

superkey

Correct

candidate key

special key

foreign key

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The correct answer is: superkey

Question 10

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_____ logic, used extensively in mathematics, provides a framework in which an assertion (statement of fact) can be verified as either true or false.

Select one:

Index

Predicate

Correct

Relational

Database

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The correct answer is: Predicate

Question 11

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A derived attribute is indicated in the Chen notation by a _____ that connects the attribute and an entity.

Select one:

single line

double dashed line

dashed line

Correct

double line

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The correct answer is: dashed line

Question 12

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A _____ attribute is one that cannot be subdivided.

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simple

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composite

single-valued

multivalued

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The correct answer is: simple

Question 13

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A(n) _____ is the set of possible values for a given attribute.

Select one:

identifier

domain

Correct

key

range

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The correct answer is: domain

Question 14

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_____ are especially useful when you are trying to determine what values in related tables cause referential integrity problems.

Select one:

Equijoins

Outer joins

Correct

Theta joins

Inner joins

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The correct answer is: Outer joins

Question 15

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A _____ relationship exists when an association is maintained within a single entity.

Select one:

weak

Incorrect

strong

unary

ternary

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The correct answer is: unary

Question 16

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A _____ attribute can be further subdivided to yield additional attributes.

Select one:

simple

composite

Correct

single-valued

multivalued

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The correct answer is: composite

Question 17

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A relationship is an association between _____.

Select one:

databases

entities

Correct

objects

fields

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The correct answer is: entities

Question 18

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_____ relationships can be implemented by creating a new entity in 1:M relationships with the original entities.

Select one:

M:N

Correct

M:1

1:1

1:N

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The correct answer is: M:N

Question 19

Correct

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A _____ entity has a primary key that is partially or totally derived from the parent entity in the relationship.

Select one:

business

child

weak

Correct

strong

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The correct answer is: weak

Question 20

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Question text

A _____ key is defined as a key that is used strictly for data retrieval purposes.

Select one:

secondary

foreign

lookup

candidate

Incorrect

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The correct answer is: secondary

Finish review

Comments

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