SQL> ed
Wrote file afiedt.buf

  1  with t (n,s,d) as (
  2  select 'товар1','склад1',date '2019-01-17' from dual union all
  3  select 'товар1','склад1',date '2019-02-07' from dual union all
  4  select 'товар1','склад3',date '2019-01-17' from dual union all
  5  select 'товар2','склад1',date '2019-01-17' from dual union all
  6  select 'товар2','склад2',date '2019-01-17' from dual)
  7  select s,to_char(trunc(d,'mm'),'yyyy month') m,count(distinct n) cc
  8  from t
  9  group by s,trunc(d,'mm')
 10* order by s,trunc(d,'mm')
SQL> /

S      M                     CC
------ ------------- ----------
склад1 2019 січень            2
склад1 2019 лютий             1
склад2 2019 січень            1
склад3 2019 січень            1

select s,to_char(trunc(d,'mm'),'yyyy month') m,count(distinct n) cc
from t
group by s,trunc(d,'mm')
order by s,trunc(d,'mm')
SQL> /