CREATE TABLE ref_product_categories (unit_of_measure VARCHAR(255), product_category_code VARCHAR(255)); CREATE TABLE products (product_category_code VARCHAR(255), product_name VARCHAR(255))
Find the unit of measurement and product category code of product named "chervil".
    
SQL: SELECT t2.unit_of_measure, t2.product_category_code FROM products AS t1 JOIN ref_product_categories AS t2 ON t1.product_category_code = t2.product_category_code WHERE t1.product_name = "chervil"