WGU C175 Study Notecards Exam Questions And Answers

WGU C175 Study Notecards Exam Questions And Answers 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 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." - ANS "A salesperson may have no customers or many customers." - ANS 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." - ANS "One salesperson backs-up another salesperson." What is the name of this model? - ANS 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? - ANS One-to-many unary relationship "A product can either be part of no other products or be part of several other products, and a product can either be composed of no other products or be composed of several other products." What is the name of this model? - ANS Many-to-many unary relationship What does 'refer' in Referential Integrity imply? - ANS This revolves around the circumstance of trying to refer to data in one relation in the database, based on values in another relation. Define the delete rule RESTRICT. - ANS If the delete rule between two relations is RESTRICT and an attempt is made to delete a record on the "one side" of the one-to-many relationship, the system will forbid the delete to take place if there are any matching foreign key values in the relation on the "many side". Define the delete rule CASCADE. - ANS If the delete rule between two relations is CASCADE and an attempt is made to delete a record on the "one side" of the relationship, not only will the record be deleted but all of the records on the "many side" of the relationship that have a matching foreign key value will also be deleted.