Consider the employee database of Fig. 1, where the primary keys are underlined. Write an SQL query to find the highest paid families in every city Assume that the total income of a family is the sum of salaries of employees living at the same address Note that you shall generate a relation highestPaidFamilies(family-income, street-number, street, city) employee(employee-id, employee-name, street-number, street, city) works(employee-id, company-id, salary) company(company-id, company-name, city) manages(employee-id, manager-id) Figure 1. Employee database