Table schema:
CREATE TABLE ref_product_categories (unit_of_measure VARCHAR, product_category_code VARCHAR); CREATE TABLE products (product_category_code VARCHAR, product_name VARCHAR)

Question: 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"