Finally, can you provide the number of characteristics of the product with the name "flax"?
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 WHERE t1.product_name  =  "flax"
number of characteristics of the product refers to COUNT(*); product with the name \"flax\" refers to WHERE product_name = 'flax'; joining tables to relate products to their characteristics;}