WGU C170 Chapter 1 Exam Questions with 100% Correct Answers

AREA Correct Answer In DB2, a named section of permanent storage space that is reserved to store the database. Associative entity Correct Answer See composite entity. Bridge entity Correct Answer See composite entity. Candidate key Correct Answer A minimal superkey; that is, a key that does not contain a subset of attributes that is itself a superkey. See key. Closure Correct Answer A property of relational operators that permits the use of relational algebra operators on existing tables (relations) to produce new relations. Composite entity Correct Answer An entity designed to transform an M:N relationship into two 1:M relationships. The composite entity's primary key comprises at least the primary keys of the entities that it connects. Also known as a bridge entity or associative entity. See also linking table. Composite key Correct Answer A multiple-attribute key. Dependent Correct Answer An attribute whose value is determined by another attribute. Determination Correct Answer The role of a key. In the context of a database table, the statement "A determines B" indicates that knowing the value of attribute A means that the value of attribute B can be looked up. DIFFERENCE Correct Answer In relational algebra, an operator used to yield all rows from one table that are not found in another union-compatible table. DIVIDE Correct Answer In relational algebra, an operator that answers queries about one set of data being associated with all values of data in another set of data. Domain Correct Answer In data modeling, the construct used to organize and describe an attribute's set of possible values. Entity integrity Correct Answer The property of a relational table that guarantees each entity has a unique value in a primary key and that the key has no null values. Equijoin Correct Answer A join operator that links tables based on an equality condition that compares specified columns of the tables.