A weak entity set can always be made into a strong entity set by adding to its attributes the primary key attributes of its identifying entity set. Outline what sort of redundancy will result if we do so.
Answer to relevant QuestionsDesign a generalization–specialization hierarchy for a motor-vehicle sales company. The company sells motorcycles, passenger cars, vans, and buses. Justify your placement of attributes at each level of the hierarchy. ...Draw the UML equivalents of the E-R diagrams. Consider the relational database of Figure, where the primary keys are underlined. Give an expression in the relational algebra to express each of the following queries:a. Find the names of all employees who work for First ...Let the following relation schemas be given: R = (A, B, C) S = (D, E, F) Let relations r(R) and s(S) be given. Give an expression in the tuple relational calculus that is equivalent to each of the following: a. II ...Consider the relational database of Figure. Give an expression in SQL for each of the following queries.a. Modify the database so that Jones now lives in Newtown.b. Give all employees of First Bank Corporation a 10 percent ...
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