SELECT count(DISTINCT T1.name) ,  T2.Headquarter FROM products AS T1 JOIN manufacturers AS T2 ON T1.Manufacturer  =  T2.code GROUP BY T2.Headquarter
Find the number of different products that are produced by companies at different headquarter cities.
SELECT count ( DISTINCT T1.name ) , T2.Headquarter FROM products AS T1 JOIN manufacturers AS T2 ON T1.Manufacturer = T2.code GROUP BY T2.Headquarter
select count ( distinct t1 . name ) , t2 . headquarter from products as t1 join manufacturers as t2 on t1 . manufacturer = t2 . code group by t2 . headquarter
Find the number of different products that are produced by companies at different headquarter cities .