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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
inner join company c on e.company_code = c.company_code
group by c.company_code, c.founder
order by c.company_code, c.founder;
my idea
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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 inner join company c on e.company_code = c.company_code group by c.company_code, c.founder order by c.company_code, c.founder;
my idea