Database: products_gen_characteristics
Question: Find the number of the products that have their color described as "red" and have a characteristic named "slow".
SQL: select count(*) 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 join ref_colors as t4 on t1.color_code  =  t4.color_code where t4.color_description  =  "red" and t3.characteristic_name  =  "slow"