attribute string Tel; relationship Set<Movie>owns inverse Movie::ownedby; }: 2.SELECT m FROM Studios a,a.owns m WHERE a.Pname=‘上海电影制片公司'； 414attribute string Tel; relationship Set<Movie} o w n s inverse Movie::ownedby; 2. SELECT m FROM Studios a, a.o w ns m WHERE a. Pname=‘上海电影制片公司 414