SELECT category FROM book_club WHERE YEAR  >  1989 GROUP BY category HAVING count(*)  >=  2
What categories have two or more corresponding books that were made after 1989?
SELECT category FROM book_club WHERE YEAR > 1989 GROUP BY category HAVING count ( * ) > = 2
select category from book_club where year > value group by category having count ( * ) > = value
What categories have two or more corresponding books that were made after 1989 ?