Find the category descriptions of the products whose descriptions include letter 't'.
create table ref_product_categories (product_category_description varchar, product_category_code varchar, PRIMARY KEY (product_category_description)); create table products (product_category_code varchar, product_description varchar, PRIMARY KEY (product_category_code))
select t1.product_category_description from ref_product_categories as t1 join products as t2 on t1.product_category_code = t2.product_category_code where t2.product_description like '%t%'