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SELECT
c.company_code
, c.founder
, count(distinct lead_manager_code) as lead_mgrs
, count(distinct senior_manager_code) AS sr_mgrs
, count(distinct manager_code) AS mgrs
, count(distinct employee_code) AS employees
from Company c
left join Employee e on e.company_code = c.company_code
group by c.company_code, founder
ORDER BY c.company_code;
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MYSQL code:
SELECT c.company_code , c.founder , count(distinct lead_manager_code) as lead_mgrs , count(distinct senior_manager_code) AS sr_mgrs , count(distinct manager_code) AS mgrs , count(distinct employee_code) AS employees from Company c left join Employee e on e.company_code = c.company_code group by c.company_code, founder ORDER BY c.company_code;