WGU C175 Pre-Assessment With Questions and
Answers
What is a broad definition of data? - answerRaw facts that are captured on printed or digital media
What are data? - answerFacts that are collected and stored in a database system
What is a determining characteristic of unstructured data? - answerIt does not follow a data model.
Which is true about flat files? - answerThey contain no internal hierarchical organization.
Which technology has no internal hierarchy? - answerFlat files
How were data retrieved before database management systems? - answerSequentially 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? - answerEntity types
Which classification is correct for the box marked "Quantity" in the given entity-relationship
diagram? - answerIntersection data
Which data classification is an entity? - answerEvent
, 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? - answerMany-to-many
Which three kinds of rules for referential integrity are provided by modern relational database
management systems? - answerInsert, Delete, Update
What is an important aspect of "referential integrity"? - answerReference 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? - answerCustomer names
What is an attribute or group of attributes that uniquely identify a tuple in a relation? -
answerPrimary 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? - answerA domain of values
What uniquely identifies each entity in a collection of entities but is not the primary key? -
answerThe 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? - answerCandidate key
What happens to the original data in database indexing? - answerIt is copied to the index.
Why are indexes created in a physical database design? - answerTo retrieve data directly using a
pointer.
Answers
What is a broad definition of data? - answerRaw facts that are captured on printed or digital media
What are data? - answerFacts that are collected and stored in a database system
What is a determining characteristic of unstructured data? - answerIt does not follow a data model.
Which is true about flat files? - answerThey contain no internal hierarchical organization.
Which technology has no internal hierarchy? - answerFlat files
How were data retrieved before database management systems? - answerSequentially 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? - answerEntity types
Which classification is correct for the box marked "Quantity" in the given entity-relationship
diagram? - answerIntersection data
Which data classification is an entity? - answerEvent
, 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? - answerMany-to-many
Which three kinds of rules for referential integrity are provided by modern relational database
management systems? - answerInsert, Delete, Update
What is an important aspect of "referential integrity"? - answerReference 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? - answerCustomer names
What is an attribute or group of attributes that uniquely identify a tuple in a relation? -
answerPrimary 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? - answerA domain of values
What uniquely identifies each entity in a collection of entities but is not the primary key? -
answerThe 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? - answerCandidate key
What happens to the original data in database indexing? - answerIt is copied to the index.
Why are indexes created in a physical database design? - answerTo retrieve data directly using a
pointer.
