WGU C175 Final+1+2 Solved Quizzes
And Answers!!
What is a broad definition of data? - Answer Raw facts that are captured on printed
or digital media
What are data? - Answer Facts that are collected and stored in a database system
What is a determining characteristic of unstructured data? - Answer It does not follow
a data model.
Which is true about flat files? - Answer They contain no internal hierarchical
organization.
Which technology has no internal hierarchy? - Answer Flat files
How were data retrieved before database management systems? - Answer
Sequentially from simple files
In which two ways does a database management system environment increase
effectiveness in working with data? - Answer - It enables data sharing,
- It permits storage of vast volumes of data.
What is the uniquely identifiable element about which data can be categorized in an
entity-relationship diagram? - Answer Entity types
Which classification is correct for the box marked "Quantity" in the given entity-
relationship diagram? - Answer Intersection data
Which data classification is an entity? - Answer Event
A salesperson is authorized to sell 12 products; a product can be sold by 10
salespersons.
Which kind of binary relationship is described in this example? - Answer Many-to-
many
Which three kinds of rules for referential integrity are provided by modern relational
database management systems? - Answer Insert, Delete, Update
What is an important aspect of "referential integrity"? - Answer Reference to data in
one relation is based on values in another relation.
Sales data, detailing the customer names, products sold, and salespersons, is kept
in a database.
Which kind of data in this database would qualify as intersection data related to both
the product and salesperson entities? - Answer Customer names
What is an attribute or group of attributes that uniquely identify a tuple in a relation? -
Answer Primary key
, WGU C175 Final+1+2 Solved Quizzes
And Answers!!
What is necessary for a primary key in one relation of a database to match with its
corresponding foreign key in another relation of the same database? - Answer A
domain of values
What uniquely identifies each entity in a collection of entities but is not the primary
key? - Answer The alternate key
What is a term for a set of columns in a table that can uniquely identify any record in
that table without referring to other data? - Answer Candidate key
What happens to the original data in database indexing? - Answer It is copied to the
index.
Why are indexes created in a physical database design? - Answer To retrieve data
directly using a pointer.
Why is an index created on a database column? - Answer To optimize data retrievals
Refer to the given SQL statement.
SELECT SPNUM, SPNAME
FROM SALESPERSON
What is the correct line to add to the end of this statement to find salespersons with
a commission percentage of 15? - Answer WHERE COMMPERCT=15;
Refer to the given SQL statement.
SELECT COMMPERCT, YEARHIRE
FROM SALESPERSON
WHERE SPNUM=22;
How should this statement be altered to retrieve the entire record instead of the
commission percentage and year of hire? - Answer Replace COMMPERCT,
YEARHIRE with an asterisk
A manager asks an employee to list attributes of the customers that are
headquartered in Los Angeles and that have a customer number higher than 1000.
Refer to the given SQL statement prepared by this employee.
SELECT CUSTNUM, CUSTNAME, HQCITY
FROM CUSTOMER
WHERE HQCITY='Los Angeles'
Which line should go at the end of this statement? - Answer AND CUSTNUM>1000;
And Answers!!
What is a broad definition of data? - Answer Raw facts that are captured on printed
or digital media
What are data? - Answer Facts that are collected and stored in a database system
What is a determining characteristic of unstructured data? - Answer It does not follow
a data model.
Which is true about flat files? - Answer They contain no internal hierarchical
organization.
Which technology has no internal hierarchy? - Answer Flat files
How were data retrieved before database management systems? - Answer
Sequentially from simple files
In which two ways does a database management system environment increase
effectiveness in working with data? - Answer - It enables data sharing,
- It permits storage of vast volumes of data.
What is the uniquely identifiable element about which data can be categorized in an
entity-relationship diagram? - Answer Entity types
Which classification is correct for the box marked "Quantity" in the given entity-
relationship diagram? - Answer Intersection data
Which data classification is an entity? - Answer Event
A salesperson is authorized to sell 12 products; a product can be sold by 10
salespersons.
Which kind of binary relationship is described in this example? - Answer Many-to-
many
Which three kinds of rules for referential integrity are provided by modern relational
database management systems? - Answer Insert, Delete, Update
What is an important aspect of "referential integrity"? - Answer Reference to data in
one relation is based on values in another relation.
Sales data, detailing the customer names, products sold, and salespersons, is kept
in a database.
Which kind of data in this database would qualify as intersection data related to both
the product and salesperson entities? - Answer Customer names
What is an attribute or group of attributes that uniquely identify a tuple in a relation? -
Answer Primary key
, WGU C175 Final+1+2 Solved Quizzes
And Answers!!
What is necessary for a primary key in one relation of a database to match with its
corresponding foreign key in another relation of the same database? - Answer A
domain of values
What uniquely identifies each entity in a collection of entities but is not the primary
key? - Answer The alternate key
What is a term for a set of columns in a table that can uniquely identify any record in
that table without referring to other data? - Answer Candidate key
What happens to the original data in database indexing? - Answer It is copied to the
index.
Why are indexes created in a physical database design? - Answer To retrieve data
directly using a pointer.
Why is an index created on a database column? - Answer To optimize data retrievals
Refer to the given SQL statement.
SELECT SPNUM, SPNAME
FROM SALESPERSON
What is the correct line to add to the end of this statement to find salespersons with
a commission percentage of 15? - Answer WHERE COMMPERCT=15;
Refer to the given SQL statement.
SELECT COMMPERCT, YEARHIRE
FROM SALESPERSON
WHERE SPNUM=22;
How should this statement be altered to retrieve the entire record instead of the
commission percentage and year of hire? - Answer Replace COMMPERCT,
YEARHIRE with an asterisk
A manager asks an employee to list attributes of the customers that are
headquartered in Los Angeles and that have a customer number higher than 1000.
Refer to the given SQL statement prepared by this employee.
SELECT CUSTNUM, CUSTNAME, HQCITY
FROM CUSTOMER
WHERE HQCITY='Los Angeles'
Which line should go at the end of this statement? - Answer AND CUSTNUM>1000;
