WGU C175 Study Notecards

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