我有一个表，其中每条记录都有列：title和category。我想找到两个标题与大多数发生在他们的类别。有些标题列在这两个类别中。如何在Hive中实现这一点？
下面是一个表创建查询：

create table book(category String, title String) row format delimited fields terminated by '\t' stored as textfile;

示例数据：

fiction book1
fiction book2
fiction book3
fiction book4
fiction book5
fiction book6
fiction book7
fiction book8
fiction book8
fiction book8
psychology  book1
psychology  book2
psychology  book2
psychology  book2
psychology  book2
psychology  book7
psychology  book7
psychology  book7

预期结果：

fiction book8
fiction any other
psychology  book2
psychology  book7

目前我已成功编写了以下查询：

SELECT * FROM  
(SELECT category, title,
             count(*) as sale_count
             from book
             Group BY category, title) a 
order by category, sale_count DESC;

这使计数为一个标题在每个类别，但我找不到方法返回只有2个顶级记录从每个类别