query: SELECT unit_of_measure FROM ref_product_categories WHERE product_category_code  =  "Herbs"
question: What unit measuerment products category codes "Herb"?
query_toks: SELECT unit_of_measure FROM ref_product_categories WHERE product_category_code = `` Herbs ''
query_toks_no_value: select unit_of_measure from ref_product_categories where product_category_code = value
question_toks: What unit measuerment products category codes "Herb"?