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SELECT
c.company_code,
c.founder,
COUNT(DISTINCT e.lead_manager_code) AS total_lead_managers,
COUNT(DISTINCT e.senior_manager_code) AS total_senior_managers,
COUNT(DISTINCT e.manager_code) AS total_managers,
COUNT(DISTINCT e.employee_code) AS total_employees
FROM Company c
LEFT JOIN Employee e
ON c.company_code = e.company_code
GROUP BY c.company_code, c.founder
ORDER BY c.company_code ASC
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my working solution :)
SELECT c.company_code, c.founder, COUNT(DISTINCT e.lead_manager_code) AS total_lead_managers, COUNT(DISTINCT e.senior_manager_code) AS total_senior_managers, COUNT(DISTINCT e.manager_code) AS total_managers, COUNT(DISTINCT e.employee_code) AS total_employees FROM Company c LEFT JOIN Employee e ON c.company_code = e.company_code GROUP BY c.company_code, c.founder ORDER BY c.company_code ASC