What are the ids of instructors who didnt' teach?
SELECT id FROM instructor EXCEPT SELECT id FROM teaches
SELECT id FROM instructor EXCEPT SELECT id FROM teaches
[{'ID': '16807'}, {'ID': '31955'}, {'ID': '35579'}, {'ID': '37687'}, {'ID': '4034'}, {'ID': '50885'}, {'ID': '52647'}, {'ID': '57180'}, {'ID': '58558'}, {'ID': '59795'}, {'ID': '63395'}, {'ID': '64871'}, {'ID': '72553'}, {'ID': '74426'}, {'ID': '78699'}, {'ID': '79653'}, {'ID': '95030'}, {'ID': '96895'}, {'ID': '97302'}]