# Question

Repeat Exercise 3.5 using the tuple relational calculus and the domain relational calculus.

## Answer to relevant Questions

Let R = (A, B) and S = (A, C), and let r(R) and s(S) be relations. Write relational-algebra expressions equivalent to the following domain-relationalcalculus expressions: a. {< a > | ∃ b (< a, b >∈ r ∧ b = ...Consider the employee database of Figure, where the primary keys are underlined.Give an expression in SQL for each of the following queries.a. Find the names of all employees who work for First Bank Corporation.b. Find the ...Consider the SQL query select p.a1 from p, r1, r2 where p.a1 = r1.a1 or p.a1 = r2.a1. Under what conditions does the preceding query select values of p.a1 that are either in r1 or in r2? Examine carefully the cases where one ...Consider the insurance database of Figure, where the primary keys are underlined. Construct the following QBE queries for this relational-database.a. Find the total number of people who owned cars that were involved in ...Describe how an arbitrary Data log rule can be expressed as an extended relational algebra view.Post your question

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