SELECT product_type_code FROM products GROUP BY product_type_code HAVING count(*)  >=  2
Show the product type codes which have at least two products.
SELECT product_type_code FROM products GROUP BY product_type_code HAVING count ( * ) > = 2
select product_type_code from products group by product_type_code having count ( * ) > = value
Show the product type codes which have at least two products .