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Consider the employee database of Fig. 1, where the primary keys are underlined. For each of the following questions, give: (1) a relational algebra expression
Consider the employee database of Fig. 1, where the primary keys are underlined. For each of the following questions, give: (1) a relational algebra expression (2) a tuple relational calculus expression (3) a domain relational calculus cxpression employee(employee-id, employee-name, street, city) works(employee-id, company-id, salary) company(company-id, company-name, city) manages(employee-id, manager-id) Figure 1. Employcc databasc Note: For each tuple of the manages relation, the manager-id is the manager's employee id. Note: This database is not the same as many answers on this platform, notice the relations between cach table. Find the names of all employees who work for First Bank Corporation. a) b) Find the names and citics of residence of all employces who work for First Bank Corporation Find the names, street addresses, and cities of residence of all employees who work for First Bank Corporation and carn morc than $10,000 c)
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