Consider the relational database of Figure where the primary key
Consider the relational database of Figure where the primary keys are underlined. Give expressions in QBE for each of the following queries:
a. Find all employees who earn more than the average salary of all employees of their company.
b. Find the company that has the most employees.
c. Find the company that has the smallest payroll.
d. Find those companies whose employees earn a higher salary, on average, than the average salary at First BankCorporation.

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