состояние в графстве SQL
select count(case Position when 'Manager' then 1 else null end)
from ...
select sum(case Position when 'Manager' then 1 else 0 end)
from ...
L
select count(case Position when 'Manager' then 1 else null end)
from ...
select sum(case Position when 'Manager' then 1 else 0 end)
from ...COUNT(CASE WHEN <condition> THEN 1 END)