Can you please show me name of the products?
select distinct product_name from products
Can you please show me the characteristic name used by least number of products?
select t3.characteristic_name from products as t1 join product_characteristics as t2 on t1.product_id = t2.product_id join characteristics as t3 on t2.characteristic_id = t3.characteristic_id group by t3.characteristic_name order by count ( * ) limit 1
Can you please show me the characteristic name used by most number of products?
select t3.characteristic_name from products as t1 join product_characteristics as t2 on t1.product_id = t2.product_id join characteristics as t3 on t2.characteristic_id = t3.characteristic_id group by t3.characteristic_name order by count ( * ) desc limit 1