C175 Practice Questions
"A salesperson works in one office."
What is the name of this relationship?
One-to-one binary relationship
"A salesperson sells to many customers."
What is the name of this relationship?
One-to-many binary relationship
"A salesperson is authorized to sell many products, and a product can be sold by many
salespersons."
What is the name of this relationship?
Many-to-many binary relationship
What is the positioning and meaning for Cardinality and Modality on an E-R model?
Cardinality is the outer symbol; represents the maximum.
Modality is the inner symbol; represents the minimum.
,"A salesperson works in a minimum of one and a maximum of one office, and an office may be
occupied by or assigned to a minimum of zero and a maximum of one salesperson."
"A salesperson may have no customers or many customers."
Describe the ER model for "Each salesperson is authorized to sell to at least one or many
products, and each product can be sold by at least one or many salespeople."
, "One salesperson backs-up another salesperson."
What is the name of this model?
One-to-one unary relationship
"A salesperson manages zero to many other salespersons, and a salesperson is managed by
exactly one other salesperson."
What is the name of this model?
One-to-many unary relationship
What does 'refer' in Referential Integrity imply?
This revolves around the circumstance of trying to refer to data in one relation in the
database, based on values in another relation.
"A salesperson works in one office."
What is the name of this relationship?
One-to-one binary relationship
"A salesperson sells to many customers."
What is the name of this relationship?
One-to-many binary relationship
"A salesperson is authorized to sell many products, and a product can be sold by many
salespersons."
What is the name of this relationship?
Many-to-many binary relationship
What is the positioning and meaning for Cardinality and Modality on an E-R model?
Cardinality is the outer symbol; represents the maximum.
Modality is the inner symbol; represents the minimum.
,"A salesperson works in a minimum of one and a maximum of one office, and an office may be
occupied by or assigned to a minimum of zero and a maximum of one salesperson."
"A salesperson may have no customers or many customers."
Describe the ER model for "Each salesperson is authorized to sell to at least one or many
products, and each product can be sold by at least one or many salespeople."
, "One salesperson backs-up another salesperson."
What is the name of this model?
One-to-one unary relationship
"A salesperson manages zero to many other salespersons, and a salesperson is managed by
exactly one other salesperson."
What is the name of this model?
One-to-many unary relationship
What does 'refer' in Referential Integrity imply?
This revolves around the circumstance of trying to refer to data in one relation in the
database, based on values in another relation.
