WGU C175 Study Notecards

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