What is the unit of measurement of product named "cumin"?
create table ref_product_categories (unit_of_measure varchar, product_category_code varchar, PRIMARY KEY (unit_of_measure)); create table products (product_category_code varchar, product_name varchar, PRIMARY KEY (product_category_code))
select t2.unit_of_measure from products as t1 join ref_product_categories as t2 on t1.product_category_code = t2.product_category_code where t1.product_name = "cumin"