WGU C175 Final Exam with Complete solutions

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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 de... termining 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 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-many 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 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 What happens to the original data in database indexing? - ANSWER It is copied to the index. Why are indexes created in a physical database design? - ANSWER To retrieve data directly using a pointer. Why is an index created on a database column? - ANSWER 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? - ANSWER 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? - ANSWER 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. SELECT CUSTNUM, CUSTNAME, HQCITY FROM CUSTOMER WHERE HQCITY='Los Angeles' Which line should go at the end of this statement? - ANSWER AND CUSTNUM>1000; What is a key difference between the DISTINCT and ORDER BY statements, in SQL SELECT commands? - ANSWER ORDER BY modifies the presentation of data results and DISTINCT filters data results. Which SQL statement alphabetizes customer names within the same satellite-office city? ORDER or ALPHA? - ANSWER ORDER BY SATCITY, CUSTNAME; The given SQL statement is intended to list the names of the products of which salesperson Fox has sold more than 500 units. SELECT PRODNAME FROM SALESPERSON, SALES, PRODUCT ? ? AND SPNAME='Fox' AND QUANTITY>500; Which set of lines should replace the question marks to make this statement work? - ANSWER WHERE SALESPERSON.SPNUM=SALES.SPNUM AND SALES.PRODNUM=PRODUCT.PRODNUM The given SQL statement is intended to query how many books there are with at least 800 pages from publishers in Los Angeles, United States. SELECT COUNT(*) ? WHERE PUBLISHER.PUBNAME=BOOK.PUBNAME AND CITY='Los Angeles' AND COUNTRY='United States' AND PAGES>=800; With which line should the question mark in this statement be replaced? - ANSWER FROM PUBLISHER, BOOK Which SQL statement will retrieve rows for all stores in Atlanta or Los Angeles or New York? - ANSWER SELECT StoreID, City FROM Suppliers WHERE City IN ('Atlanta', 'Los Angeles', 'New York'); Refer to the given SQL statement to answer the following question: SELECT * FROM PRODUCT; What would this SQL statement accomplish? - ANSWER List all entries in the PRODUCT table. What is a methodology for organizing attributes into tables? - ANSWER Data normalization What is the term for the value of one particular attribute associated with a specific single value of another attribute? - ANSWER Functional dependency Which set of results should a company expect from implementing a business intelligence system? - ANSWER Increased profitability and increased throughput Which issue is focused on the loading component of extract, transform, load (ETL)? - ANSWER Monitor refreshing volume and frequency During which step in the extract, transform, load (ETL) process are raw data sets aggregated? - ANSWER Transformation How is prediction distinguished from estimation in data mining? - ANSWER Prediction classifies objects according to an expected future behavior. Where does affinity grouping occur in data mining? - ANSWER Between objects Which item represents unstructured data? A. Video training content. B. SQL tables of training instructors. C.Relational db for training tracking. D. Training db backup - ANSWER A. Training Video Content What is the entity-relationship diagram about a car rental agency showing? - ANSWER One manufacturer created at least one of the agency's cars Image shows Salesperson (with 1 bar) to Customers (with 1 bar). How is the cardinality of the customers misrepresented? - ANSWER There are many customers, but the cardinality indicates one customer. Image shows Salesperson (with 2 bars) to Customer (with open circle and Crow's Feet). What is the correct way to read the modality on the right side of the association? - ANSWER A minimum of zero customers Project Code Employee No. Employee Name Department No. Department Name Hourly Rate PC010 S10001 A. Smith L004 IT 22.00 PC010 S10030 L. Jones L023 Pensions 18.50 PC010 S21010 P. Lewis L004 IT 21.00 PC045 S10010 B. Jones L004 IT 21.75 PC045 S10001 A. Smith L004 IT 18.00 PC045 S31002 T. Gilbert L028 Database 25.50 PC045 S13210 W. Richards L008 Salary 17.00 PC064 S31002 T. Gilbert L028 Database 23.25 PC064 S21010 P. Lewis L004 IT 17.50 PC064 S10034 B. James L009 HR 16.50 In which state are the attributes shown? - ANSWER First normal form Students IDSt LastName IDProf Prof Grade 1 Mueller 3 Schmid 5 2 Meier 2 Borner 4 3 Tobler 1 Bernasconi 6 [Show More]

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