hadoop - 如何在配置单元中设置限制子句的范围

Question

How to set range for limit clause in hive，我已经尝试了下面的查询但由于语法错误而失败。有人可以帮忙吗

select * from table limit 1000,2000;

Answer 1

您可以使用Row_Number 窗口函数并设置范围限制。

下面的查询将只返回表中的前 20 条记录

   hive> select * from 
        (
        SELECT *,ROW_NUMBER() over (Order by id) as rowid FROM <tab_name>
        )t 
    where rowid > 0 and rowid <=20;

使用Between运算符指定范围

 hive> select * from 
            (
            SELECT *,ROW_NUMBER() over (Order by id) as rowid FROM <tab_name>
            )t 
        where rowid between 0 and 20;

从 20 到 40 获取行，然后增加下限/上限值

  hive> select * from 
            (
            SELECT *,ROW_NUMBER() over (Order by id) as rowid FROM <tab_name>
            )t 
        where rowid > 20 and rowid <=40;