Define the concept of aggregation. Give two examples of where this concept is useful.
Answer to relevant QuestionsConsider an E-R diagram in which the same entity set appears several times. Why is allowing this redundancy a bad practice that one should avoidwhenever possible?Consider the representation of a ternary relationship using binary relationships as described in Section 2.4.3 (shown in Figure b)a. Show a simple instance of E, A, B, C, RA, RB, and RC that cannot correspond to any instance ...Draw the UML equivalents of the E-R diagrams. Consider the relation of as shown below, which shows the result of the query “Find the names of all customers who have a loan at the bank.” Rewrite the query to include not only the name, but also the city of residence ...Repeat Exercise 3.5 using the tuple relational calculus and the domain relational calculus.
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