CREATE TABLE product_characteristics (characteristic_id VARCHAR)
CREATE TABLE CHARACTERISTICS (characteristic_name VARCHAR, other_characteristic_details VARCHAR, characteristic_data_type VARCHAR, characteristic_id VARCHAR)

What are the names, details and data types of the characteristics which are never used by any product?
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
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"