WGU C175 Practice Study Guide Questions
with Distinction level Marking scheme
version 2024/2025
What is a determining characteristic of unstructured data? - correct answer It does not
follow a data model.
Which is true about flat files? - correct answer They contain no internal hierarchical
organization.
Which technology has no internal hierarchy? - correct answer Flat files
How were data retrieved before database management systems? - correct answer
Sequentially from simple files
In which two ways does a database management system environment increase
effectiveness in working with data? - correct 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? - correct answer Entity types
Which classification is correct for the box marked "Quantity" in the given entity-
relationship diagram? - correct answer Intersection data
Which data classification is an entity? - correct 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? - correct answer Many-
to-many
Which three kinds of rules for referential integrity are provided by modern relational
database management systems? - correct answer Insert, Delete, Update
What is an important aspect of "referential integrity"? - correct 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? - correct answer Customer names
What is an attribute or group of attributes that uniquely identify a tuple in a relation? -
correct answer 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? - correct answer
A domain of values
What uniquely identifies each entity in a collection of entities but is not the primary key?
- correct 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? - correct answer Candidate key
What happens to the original data in database indexing? - correct answer It is copied
to the index.
with Distinction level Marking scheme
version 2024/2025
What is a determining characteristic of unstructured data? - correct answer It does not
follow a data model.
Which is true about flat files? - correct answer They contain no internal hierarchical
organization.
Which technology has no internal hierarchy? - correct answer Flat files
How were data retrieved before database management systems? - correct answer
Sequentially from simple files
In which two ways does a database management system environment increase
effectiveness in working with data? - correct 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? - correct answer Entity types
Which classification is correct for the box marked "Quantity" in the given entity-
relationship diagram? - correct answer Intersection data
Which data classification is an entity? - correct 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? - correct answer Many-
to-many
Which three kinds of rules for referential integrity are provided by modern relational
database management systems? - correct answer Insert, Delete, Update
What is an important aspect of "referential integrity"? - correct 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? - correct answer Customer names
What is an attribute or group of attributes that uniquely identify a tuple in a relation? -
correct answer 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? - correct answer
A domain of values
What uniquely identifies each entity in a collection of entities but is not the primary key?
- correct 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? - correct answer Candidate key
What happens to the original data in database indexing? - correct answer It is copied
to the index.
