Please help with only a,b,c, and d

Thank you, please explain if possible.

(120) 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, and (3) a domain relational calculus expression. Note that each problem has 15 points with 5 points for each of the thre 1. e required expressions. Find the names of all employees who work for First Bank Corporation. Bank Corporation. who work for First Bank Corporation and earn more than S10,000 companies for which they work. same streets as do their managers Corporation. Small Bank Corporation. companies located in every city in which Small Bank Corporation is a. b. Find the names and cities of residence of all employees who work for First c. Find the names, street addresses, and cities of residence of all employees d. Find all employees in the database who live in the same cities as the e. Find all employees in the database who live in the same cities and on the f. Find all employees in the database who do not work for the First Bank g. Find all employees in the database who earn more than each employee of h. Assume that the companies may be located in several cities. Find all located employee(employee-id, employee-name, street, city) works(employee-id, company-id, salary) company(company-id, company-name, city) manages(emplovee-id, manager-id) Figure 1. Employee database Note: For each tuple of the manages relation, the manager-id is the manager's employee id (120) 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, and (3) a domain relational calculus expression. Note that each problem has 15 points with 5 points for each of the thre 1. e required expressions. Find the names of all employees who work for First Bank Corporation. Bank Corporation. who work for First Bank Corporation and earn more than S10,000 companies for which they work. same streets as do their managers Corporation. Small Bank Corporation. companies located in every city in which Small Bank Corporation is a. b. Find the names and cities of residence of all employees who work for First c. Find the names, street addresses, and cities of residence of all employees d. Find all employees in the database who live in the same cities as the e. Find all employees in the database who live in the same cities and on the f. Find all employees in the database who do not work for the First Bank g. Find all employees in the database who earn more than each employee of h. Assume that the companies may be located in several cities. Find all located employee(employee-id, employee-name, street, city) works(employee-id, company-id, salary) company(company-id, company-name, city) manages(emplovee-id, manager-id) Figure 1. Employee database Note: For each tuple of the manages relation, the manager-id is the manager's employee id