Show publishers with a book published in 1989 and a book in 1990.
SELECT publisher FROM book_club WHERE YEAR  =  1989 INTERSECT SELECT publisher FROM book_club WHERE YEAR  =  1990
SELECT publisher FROM book_club WHERE YEAR  =  1989 INTERSECT SELECT publisher FROM book_club WHERE YEAR  =  1990
[{'Publisher': 'Alyson'}, {'Publisher': 'Banned Books'}]