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SELECT c.company_code,
c.founder,
COUNT(DISTINCT e.lead_manager_code),
COUNT(DISTINCT e.senior_manager_code),
COUNT(DISTINCT e.manager_code),
COUNT(DISTINCT e.employee_code)
FROM Employee e, Company c
WHERE c.company_code = e.company_code
GROUP BY e.company_code, c.founder
ORDER BY c.company_code;
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More easier version is here.
SELECT c.company_code, c.founder, COUNT(DISTINCT e.lead_manager_code), COUNT(DISTINCT e.senior_manager_code), COUNT(DISTINCT e.manager_code), COUNT(DISTINCT e.employee_code) FROM Employee e, Company c WHERE c.company_code = e.company_code GROUP BY e.company_code, c.founder ORDER BY c.company_code;