WGU C175/d426 Data Management Foundations Final Exam Study Review Solutions.

WGU C175/d426 Data Management Foundations Final Exam Study Review Solutions. What is a broad definition of data? Raw facts that are captured on printed or digital media What are data? Facts that are collected and stored in a database system What is a determining characteristic of unstructured data? It does not follow a data model. Which is true about flat files? They contain no internal hierarchical organization. Which technology has no internal hierarchy? Flat files How were data retrieved before database management systems? Sequentially from simple files In which two ways does a database management system environment increase effectiveness in working with data? - 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? Entity types Which classification is correct for the box marked "Quantity" in the given entity-relationship diagram? Intersection data Which data classification is an entity? Event A salesperson is authorized to sell 12 products; a product can be sold by 10 salespersons. WGU C175/d426 Data Management Foundations Final Exam Study Review Solutions Which kind of binary relationship is described in this example? Many-to-many Which three kinds of rules for referential integrity are provided by modern relational database management systems? Insert, Delete, Update What is an important aspect of "referential integrity"? 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? Customer names What is an attribute or group of attributes that uniquely identify a tuple in a relation? 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? A domain of values What uniquely identifies each entity in a collection of entities but is not the primary key? The 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? Candidate key What happens to the original data in database indexing? It is copied to the index. Why are indexes created in a physical database design? To retrieve data directly using a pointer. Why is an index created on a database column? To optimize data retrievals Refer to the given SQL statement. SELECT SPNUM, SPNAME FROM SALESPERSON What is the correct line to add to the end of this statement to find salespersons with a commission percentage of 15? WHERE COMMPERCT=15; Refer to the given SQL statement. SELECT COMMPERCT, YEARHIRE FROM SALESPERSON WHERE SPNUM=22; How should this statement be altered to retrieve the entire record instead of the commission percentage and year of hire? Replace COMMPERCT, YEARHIRE with an asterisk A manager asks an employee to list attributes of the customers that are headquartered in Los Angeles and that have a customer number higher than 1000. Refer to the given SQL statement prepared by this employee.