✔ 最佳答案
Sample only:-
Q{-expression operator--------------------->A:-True value yield;)
(1)22 not in------------------------------------>(1,2,Null)=F,Not False,Un=not un;
(2)negate the NOT(not)(refers to (1A)---------------------------->un
(3)subqueryNOT in(refers to(1Q))---------------------------->un,the predicate=Null
(4)outerqueryNOT in(refers to (3)-------------------------->un,the empty set.(returns as an empty set).