Question

I am to write a stored function to retrieve the number of items of a given product that have been delivered in the last year, and write a SQL Select statement that uses the function to display product no and name + no of items delivered in the last year for all products.

Please help me out

Thanks

Answer 1

I suppose you have a delivery table and a product table.

create or replace function prod_delivered_cnt (p_prod_id in number) as
  v_res number;
begin
  select count(*) into v_res 
  from delivery_table d 
  where d.prod_id = p_prod_id 
  and d.date < to_date('2011', 'yyyy');
  return v_res;
end prod_delivered_cnt;

select p.prod_num, p.prod_name, prod_delivered_cnt(p.id) as cnt 
from product_table p;