query: SELECT publisher FROM book_club WHERE YEAR  =  1989 INTERSECT SELECT publisher FROM book_club WHERE YEAR  =  1990
question: A Show alla publisher one a book a-published 1989 and one a book 1990.
query_toks: SELECT publisher FROM book_club WHERE YEAR = 1989 INTERSECT SELECT publisher FROM book_club WHERE YEAR = 1990
query_toks_no_value: select publisher from book_club where year = value intersect select publisher from book_club where year = value
question_toks: A Show alla publisher one a book a-published 1989 and one a book 1990.