SQL> CREATE TABLE sales(
2 product_id NUMBER(6),
3 cid NUMBER,
4 time_id DATE,
5 sold NUMBER(3),
6 amount NUMBER(10,2),
7 cost NUMBER(10,2)
8 );
Table created.
SQL>
SQL> select product_id,
2 sum(sold),
3 rank () over (order by sum(sold) desc) as rank,
4 dense_rank () over (order by sum(sold) desc) as dense_rank
5 from sales
6 where to_char(time_id, 'yyyy-mm') = '2001-06'
7 group by product_id;
no rows selected
SQL>
SQL> drop table sales;
Table dropped.