WGU C175 Final+1+2
What is a broad definition of data? - ANS-Raw facts that are captured on printed or
digital media
What are data? - ANS-Facts that are collected and stored in a database system
What is a determining characteristic of unstructured data? - ANS-It does not follow a
data model.
Which is true about flat files? - ANS-They contain no internal hierarchical organization.
Which technology has no internal hierarchy? - ANS-Flat files
How were data retrieved before database management systems? - ANS-Sequentially
from simple files
In which two ways does a database management system environment increase
effectiveness in working with data? - 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? - ANS-Entity types
Which classification is correct for the box marked "Quantity" in the given
entity-relationship diagram? - ANS-Intersection data
Which data classification is an entity? - 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? - ANS-Many-to-many
Which three kinds of rules for referential integrity are provided by modern relational
database management systems? - ANS-Insert, Delete, Update
, What is an important aspect of "referential integrity"? - ANS-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? - ANS-Customer names
What is an attribute or group of attributes that uniquely identify a tuple in a relation? -
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 of the same database? - ANS-A domain of
values
What uniquely identifies each entity in a collection of entities but is not the primary key?
- ANS-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? - ANS-Candidate key
What happens to the original data in database indexing? - ANS-It is copied to the index.
Why are indexes created in a physical database design? - ANS-To retrieve data directly
using a pointer.
Why is an index created on a database column? - 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? - ANS-WHERE COMMPERCT=15;
Refer to the given SQL statement.
SELECT COMMPERCT, YEARHIRE
What is a broad definition of data? - ANS-Raw facts that are captured on printed or
digital media
What are data? - ANS-Facts that are collected and stored in a database system
What is a determining characteristic of unstructured data? - ANS-It does not follow a
data model.
Which is true about flat files? - ANS-They contain no internal hierarchical organization.
Which technology has no internal hierarchy? - ANS-Flat files
How were data retrieved before database management systems? - ANS-Sequentially
from simple files
In which two ways does a database management system environment increase
effectiveness in working with data? - 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? - ANS-Entity types
Which classification is correct for the box marked "Quantity" in the given
entity-relationship diagram? - ANS-Intersection data
Which data classification is an entity? - 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? - ANS-Many-to-many
Which three kinds of rules for referential integrity are provided by modern relational
database management systems? - ANS-Insert, Delete, Update
, What is an important aspect of "referential integrity"? - ANS-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? - ANS-Customer names
What is an attribute or group of attributes that uniquely identify a tuple in a relation? -
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 of the same database? - ANS-A domain of
values
What uniquely identifies each entity in a collection of entities but is not the primary key?
- ANS-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? - ANS-Candidate key
What happens to the original data in database indexing? - ANS-It is copied to the index.
Why are indexes created in a physical database design? - ANS-To retrieve data directly
using a pointer.
Why is an index created on a database column? - 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? - ANS-WHERE COMMPERCT=15;
Refer to the given SQL statement.
SELECT COMMPERCT, YEARHIRE
