Database: products_gen_characteristics
Question: Give the names, details, and data types of characteristics that are not found in any product.
SQL: select characteristic_name ,  other_characteristic_details ,  characteristic_data_type from characteristics except select t1.characteristic_name ,  t1.other_characteristic_details ,  t1.characteristic_data_type from characteristics as t1 join product_characteristics as t2 on t1.characteristic_id  =  t2.characteristic_id