Oracle 查询中缺少右括号

Question

对于 S9 商店，我正在尝试查找为其发布最多评论数的用户的朋友。

我有以下疑问：

select friend_id 
  from friends 
 where user_id = ( select author_id 
                     from posted_reviews_tab   
                    where rownum <= 1 
                      and reviewid in ( select w.reviews.reviewid 
                                          from wall_tab w  
                                         where w.shopid = 'S9' ) 
                    group by author_id 
                    order by count(author_id) desc );

我收到以下错误：

SQL 错误：ORA-00907：缺少右括号 00907. 00000 - “缺少右括号”

Answer 1

选择中有错字：

select friend_id 
  from friends 
 where user_id = ( select author_id 
                     from posted_reviews_tab   
                    where rownum <= 1 
                                        --w.reviews.reviewid is wrong
                      and reviewid in ( select w.reviews.reviewid 
                                          from wall_tab w  
                                         where w.shopid = 'S9' ) 
                    group by author_id 
                    order by count(author_id) desc );

如果这不是拼写错误，您必须输入 join 才能到达“.reviews”，因为该语法是不可能的。