WGU C175 Pre-Assessment Exam Questions With 100% Correct 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. Which kind of binary relationship is described in this example? - Many-to-manyWhich 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, SPNAMEFROM 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