Question

select distinct a.person.name, b.title,b.director.name 
  from movie_roles a, movie b
 where a.person.name=
 ( select b.director.name 
     from movie b, movie_roles a
    where b.director.name=a.person.name)
  and b.movieID=a.movie.movieID;

我不断收到错误，说单个单子查询在Oracle中返回多行任何人都可以帮我解决这个问题吗？

Answer 1

它自我解释。在以下一行

where a.person.name= ( select b.director.name from movie b, movie_roles a where b.director.name=a.person.name)

您获得多个结果，因此您无法使用＆＃34; =＆＃34;。试试

where a.person.name IN( select b.director.name from movie b, movie_roles a where b.director.name=a.person.name)

Single Subquery在Oracle中返回多行

1 个答案: