WGU C175 Study Guide |Revised Exam| 100% Correct

WGU C175 Study Guide |Revised Exam| 100% Correct Flat Files *Ans* a file having no internal hierarchy Hashed Files *Ans* A file that has been encrypted for security purposes. Heap File *Ans* An unsorted set of records. Information *Ans* The transformation of raw data into useful facts. Punch Card *Ans* A card that is perforated and can hold commands or data. Structured Data *Ans* Information with a high degree of organization. Unstructured Data *Ans* Information that does not have structure (such as text) Binary Relationship *Ans* A relationship between two entity types. Unary Relationship *Ans* An associate occurrence of an entity type with other occurrences of the same entity type. Cardinality *Ans* The maximum number of entities that can be involved in a particular relationship. E-R Model *E-R = Entity - Relationship *Ans* Diagram of entities together with their attributes and the relationship among them. Intersection Data *Ans* It is data that describes a many-to-many relationship. Modality *Ans* It is a minimum number of entity occurrences that can be involved in a relationship. One-to-one Binary Relationship *Ans* 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. Ternary Relationship *Ans* Involves three different entity types. Unique identifier *Ans* It is used to uniquely identify each record in a database table. Attribute *Ans* A property, characteristic, or fact that we know about an entity. "A salesperson works in one office." What is the name of this relationship? *Ans* One-to-one binary relationship "A salesperson sells to many customers." What is the name of this relationship? *Ans* 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? *Ans* Many-to-many binary relationship What is the positioning and meaning for Cardinality and Modality on an E-R model? *Ans* Cardinality is the outer symbol; represents the maximum. Modality is the inner symbol; represents the minimum. "A salesperson works in