WGU C175 Study Notecards With Questions And CORRECT
DETAILED ANSWERS
1. Flat Files: a file having no internal hierarchy
2. Hashed Files: A file that has been encrypted for security purposes.
3. Heap File: An unsorted set of records.
4. Information: The transformation of raw data into useful facts.
5. Punch Card: A card that is perforated and can hold commands or data.
6. Structured Data: Information with a high degree of organization.
7. Unstructured Data: Information that does not have structure (such as text)
8. Binary Relationship: A relationship between two entity types.
9. Unary Relationship: An associate occurrence of an entity type with other
occurrences of the same entity type.
10. Cardinality: The maximum number of entities that can be involved in a
particular relationship.
,11. E-R Model
*E-R = Entity - Relationship: Diagram of entities together with their attributes and
the relationship among them.
12. Intersection Data: It is data that describes a many-to-many relationship.
13. Modality: It is a minimum number of entity occurrences that can be involved
in a relationship.
14. One-to-one Binary Relationship: It means that a single occurrence of one
entity type can be associated with a single occurrence of the other entity type
and vice versa.
15. Ternary Relationship: Involves three different entity types.
16. Unique identifier: It is used to uniquely identify each record in a database
table.
17. Attribute: A property, characteristic, or fact that we know about an entity.
18. "A salesperson works in one office."
What is the name of this relationship?: One-to-one binary relationship
19. "A salesperson sells to many customers."
, What is the name of this relationship?: One-to-many binary relationship
20. "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
21. 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.
22. "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.":
23. "A salesperson may have no customers or many customers." :
24. 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.":
25. "One salesperson backs-up another salesperson."
DETAILED ANSWERS
1. Flat Files: a file having no internal hierarchy
2. Hashed Files: A file that has been encrypted for security purposes.
3. Heap File: An unsorted set of records.
4. Information: The transformation of raw data into useful facts.
5. Punch Card: A card that is perforated and can hold commands or data.
6. Structured Data: Information with a high degree of organization.
7. Unstructured Data: Information that does not have structure (such as text)
8. Binary Relationship: A relationship between two entity types.
9. Unary Relationship: An associate occurrence of an entity type with other
occurrences of the same entity type.
10. Cardinality: The maximum number of entities that can be involved in a
particular relationship.
,11. E-R Model
*E-R = Entity - Relationship: Diagram of entities together with their attributes and
the relationship among them.
12. Intersection Data: It is data that describes a many-to-many relationship.
13. Modality: It is a minimum number of entity occurrences that can be involved
in a relationship.
14. One-to-one Binary Relationship: It means that a single occurrence of one
entity type can be associated with a single occurrence of the other entity type
and vice versa.
15. Ternary Relationship: Involves three different entity types.
16. Unique identifier: It is used to uniquely identify each record in a database
table.
17. Attribute: A property, characteristic, or fact that we know about an entity.
18. "A salesperson works in one office."
What is the name of this relationship?: One-to-one binary relationship
19. "A salesperson sells to many customers."
, What is the name of this relationship?: One-to-many binary relationship
20. "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
21. 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.
22. "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.":
23. "A salesperson may have no customers or many customers." :
24. 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.":
25. "One salesperson backs-up another salesperson."
