Oracle SQL join three tables and group by column
select
t.name,
count(distinct r.idc) as number_of_classes
from
teacher t
join
reserve r on r.idt = t.idt
join
class c on c.idc = r.idc
group by
t.nameOracle SQL join three tables and group by column
select
t.name,
count(distinct r.idc) as number_of_classes
from
teacher t
join
reserve r on r.idt = t.idt
join
class c on c.idc = r.idc
group by
t.nameCopyright © 2021 Codeinu
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