CREATE TABLE movie (movie_id NUMBER, title CLOB, year NUMBER, director CLOB, budget_million NUMBER, gross_worldwide NUMBER)
CREATE TABLE culture_company (company_name CLOB, type CLOB, incorporated_in CLOB, group_equity_shareholding NUMBER, book_club_id CLOB, movie_id CLOB)
CREATE TABLE book_club (book_club_id NUMBER, year NUMBER, author_or_editor CLOB, book_title CLOB, publisher CLOB, category CLOB, result CLOB)

What are the publishers who have published a book in both 1989 and 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