query: SELECT avg(product_price) ,  product_category_code FROM products GROUP BY product_category_code
question: What that average price of the products for each category?
query_toks: SELECT avg ( product_price ) , product_category_code FROM products GROUP BY product_category_code
query_toks_no_value: select avg ( product_price ) , product_category_code from products group by product_category_code
question_toks: What that average price of the products for each category?