Table schema:
CREATE TABLE table_name_4 (condition VARCHAR, platelet_count VARCHAR, partial_thromboplastin_time VARCHAR, prothrombin_time VARCHAR)

Question: Name the condition with partial thromboplastin time of unaffected and prothrombin time of unaffected with platelet count of decreased
SQL: SELECT condition FROM table_name_4 WHERE partial_thromboplastin_time = "unaffected" AND prothrombin_time = "unaffected" AND platelet_count = "decreased"