WGU C175 Final+1+2, Questions and
Correct Answers, Complete Solution 2024.
What is a broad definition of data?
Raw facts that are captured on printed or digital media
What are data?
Facts that are collected and stored in a database system
What is a determining characteristic of unstructured data?
It does not follow a data model.
Which is true about flat files?
They contain no internal hierarchical organization.
Which technology has no internal hierarchy?
Flat files
How were data retrieved before database management systems?
Sequentially from simple files
In which two ways does a database management system environment increase
effectiveness in working with data?
- 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?
Entity types
Which classification is correct for the box marked "Quantity" in the given entity-
relationship diagram?
Intersection data
Which data classification is an entity?
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?
Many-to-many
Which three kinds of rules for referential integrity are provided by modern
relational database management systems?
Insert, Delete, Update
What is an important aspect of "referential integrity"?
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?
Customer names
, What is an attribute or group of attributes that uniquely identify a tuple in a
relation?
Primary key
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?
A domain of values
What uniquely identifies each entity in a collection of entities but is not the
primary key?
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?
Candidate key
What happens to the original data in database indexing?
It is copied to the index.
Why are indexes created in a physical database design?
To retrieve data directly using a pointer.
Why is an index created on a database column?
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?
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?
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?
AND CUSTNUM>1000;
Correct Answers, Complete Solution 2024.
What is a broad definition of data?
Raw facts that are captured on printed or digital media
What are data?
Facts that are collected and stored in a database system
What is a determining characteristic of unstructured data?
It does not follow a data model.
Which is true about flat files?
They contain no internal hierarchical organization.
Which technology has no internal hierarchy?
Flat files
How were data retrieved before database management systems?
Sequentially from simple files
In which two ways does a database management system environment increase
effectiveness in working with data?
- 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?
Entity types
Which classification is correct for the box marked "Quantity" in the given entity-
relationship diagram?
Intersection data
Which data classification is an entity?
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?
Many-to-many
Which three kinds of rules for referential integrity are provided by modern
relational database management systems?
Insert, Delete, Update
What is an important aspect of "referential integrity"?
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?
Customer names
, What is an attribute or group of attributes that uniquely identify a tuple in a
relation?
Primary key
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?
A domain of values
What uniquely identifies each entity in a collection of entities but is not the
primary key?
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?
Candidate key
What happens to the original data in database indexing?
It is copied to the index.
Why are indexes created in a physical database design?
To retrieve data directly using a pointer.
Why is an index created on a database column?
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?
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?
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?
AND CUSTNUM>1000;
