WGU C175/d426 Data Management Foundations Final
Exam Study Review Solutions Basic key words 2025-2026
What is a broad definition of data? << CORRECT ANS--Raw facts that are captured on printed or digital media
Which technology has no internal hierarchy? << CORRECT ANS--Flat files
How were data retrieved before database management systems? << CORRECT ANS--Sequentially from simple files
In which two ways does a database management system environment increase effectiveness in working with data? << CORRE
ANS--- 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? << CORREC
ANS--Entity types
Which classification is correct for the box marked "Quantity" in the given entity-relationship diagram? << CORRECT ANS--
Intersection data
Which data classification is an entity? << CORRECT ANS--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? << CORRECT ANS--Many-to-many
Which three kinds of rules for referential integrity are provided by modern relational database management systems? <<
CORRECT ANS--Insert, Delete, Update
What is an important aspect of "referential integrity"? << CORRECT ANS--Reference to data in one relation is based on value
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? <<
CORRECT ANS--Customer names
What is an attribute or group of attributes that uniquely identify a tuple in a relation? << CORRECT ANS--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
the same database? << CORRECT ANS--A domain of values
What uniquely identifies each entity in a collection of entities but is not the primary key? << CORRECT ANS--The alternate k
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?
CORRECT ANS--Candidate key
What happens to the original data in database indexing? << CORRECT ANS--It is copied to the index.
Why are indexes created in a physical database design? << CORRECT ANS--To retrieve data directly using a pointer.
Why is an index created on a database column? << CORRECT ANS--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? <<
CORRECT ANS--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? <<
CORRECT ANS--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'
Exam Study Review Solutions Basic key words 2025-2026
What is a broad definition of data? << CORRECT ANS--Raw facts that are captured on printed or digital media
Which technology has no internal hierarchy? << CORRECT ANS--Flat files
How were data retrieved before database management systems? << CORRECT ANS--Sequentially from simple files
In which two ways does a database management system environment increase effectiveness in working with data? << CORRE
ANS--- 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? << CORREC
ANS--Entity types
Which classification is correct for the box marked "Quantity" in the given entity-relationship diagram? << CORRECT ANS--
Intersection data
Which data classification is an entity? << CORRECT ANS--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? << CORRECT ANS--Many-to-many
Which three kinds of rules for referential integrity are provided by modern relational database management systems? <<
CORRECT ANS--Insert, Delete, Update
What is an important aspect of "referential integrity"? << CORRECT ANS--Reference to data in one relation is based on value
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? <<
CORRECT ANS--Customer names
What is an attribute or group of attributes that uniquely identify a tuple in a relation? << CORRECT ANS--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
the same database? << CORRECT ANS--A domain of values
What uniquely identifies each entity in a collection of entities but is not the primary key? << CORRECT ANS--The alternate k
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?
CORRECT ANS--Candidate key
What happens to the original data in database indexing? << CORRECT ANS--It is copied to the index.
Why are indexes created in a physical database design? << CORRECT ANS--To retrieve data directly using a pointer.
Why is an index created on a database column? << CORRECT ANS--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? <<
CORRECT ANS--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? <<
CORRECT ANS--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'
