WGU C175 Pre-Assessment Exam All Possible Questions and Answers with complete solution

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 entityrelationship diagram? - Answer-Entity types Which classification is correct for the box marked "Quantity" in the given entity-relationship 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-to-manyWhich 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? - AnswerPrimary 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? - AnswerThe alternate key What is a term for a set of columns in a table that can uniquely identify any record in that table without referring to other data? - Answer-Candidate key