Question: Find the number of characteristics that the product "flax" has.
Schema: create table characteristics (characteristic_id varchar, PRIMARY KEY (characteristic_id)); create table products (product_id varchar, product_name varchar, PRIMARY KEY (product_id)); create table product_characteristics (product_id varchar, characteristic_id varchar, PRIMARY KEY (product_id))
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 where t1.product_name = "flax"