WGU C175 QUESTIONS WITH CORRECT ANSWERS

WGU C175 QUESTIONS WITH CORRECT ANSWERS What is a broad definition of data? - ANSWER Raw facts that are captured on printed or digital media What are data? - ANSWER Facts that are collected and stored in a database system What is a determining characteristic of unstructured data? - ANSWER It does not follow a data model. Which is true about flat files? - ANSWER They contain no internal hierarchical organization. Which technology has no internal hierarchy? - ANSWER Flat files How were data retrieved before database management systems? - ANSWER Sequentially from simple files In which two ways does a database management system environment increase effectiveness in working with data? - ANSWER - It enables data sharing, - It permits storage of vast volumes of data. What is the uniquely identifiable element about which data can be categorized in an entity-relationship diagram? - ANSWER Entity types Which classification is correct for the box marked "Quantity" in the given entityrelationship diagram? - ANSWER Intersection data Which data classification is an entity? - ANSWER Event A salesperson is authorized to sell 12 products; a product can be sold by 10 salespersons. Which kind of binary relationship is described in this example? - ANSWER Many-tomany Which three kinds of rules for referential integrity are provided by modern relational database management systems? - ANSWER Insert, Delete, Update What is an important aspect of "referential integrity"? - ANSWER Reference to data in one relation is based on values in another relation. Sales data, detailing the customer names, products sold, and salespersons, is kept in a database. Which kind of data in this database would qualify as intersection data related to both the product and salesperson entities? - ANSWER Customer names What is an attribute or group of attributes that uniquely identify a tuple in a relation? - ANSWER Primary key What is necessary for a primary key in one relation of a database to match with its corresponding foreign key in another relation of the same database? - ANSWER A domain of values What uniquely identifies each entity in a collection of entities but is not the primary key? - ANSWER The alternate key