Database: tracking_software_problems
Question: For each product that has problems, find the number of problems reported after 1986-11-13 and the product id?
SQL: select count(*) ,  t2.product_id from problems as t1 join product as t2 on t1.product_id = t2.product_id where t1.date_problem_reported > "1986-11-13" group by t2.product_id