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(17) Create an example of a recursive relationship with an m:n cardinality constraint?
(16) Describe how Married_to can be modeled as a recursive relationship?
(15) What is the difference between a binary relationship that exhibits a 1:1 cardinality constraint and a binary relationship that exhibits a 1:n cardinality constraint?
(9) Consider the EMPLOYEE entity type given below. a. List all key and non-key attributes. b. What is (are) the unique identifier(s)? c. Which attribute(s) is (are) derived attributes? d. Using the figure in Exercise 9 as a guide, develop sample data for four employees that illustrate the nature of the various mandatory and optional attributes in the EMPLOYEE entity. Be sure to illustrate the various ways the Name attribute might appear.
(6) Distinguish between a simple attribute, a single-valued attribute, a composite attribute, a multi-valued attribute, and a complex attribute. Develop an example similar to Figure 2.3 that illustrates the difference between each type of attribute?
(4) What is the difference between a stored attribute and a derived attribute?
(3) Describe various data types associated with attributes?
(2) Use examples to distinguish between: a. An object type and an entity type b. An object and an entity c. A property and an attribute d. An entity and an entity instance e. An association and a relationship f. An object class and an entity class
(1) What is the difference between the conceptual world and the real world? Is it possible for a conceptual model to represent reality in total? Why or why not?
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