数据湖探索 DLI-row_number:示例代码

时间：2023-11-30 11:21:37

数据湖探索 DLI

示例代码

为便于理解函数的使用方法，本文为您提供源数据，基于源数据提供函数相关示例。创建表logs，并添加数据，命令示例如下：

CREATE TABLE logs (
cookieid string,
createtime string,
pv INT
) ROW FORMAT DELIMITED FIELDS TERMINATED BY ',' 
stored as textfile;

添加数据如下：

cookie1 2015-04-10 1
cookie1 2015-04-11 5
cookie1 2015-04-12 7
cookie1 2015-04-13 3
cookie1 2015-04-14 2
cookie1 2015-04-15 4
cookie1 2015-04-16 4
cookie2 2015-04-10 2
cookie2 2015-04-11 3
cookie2 2015-04-12 5
cookie2 2015-04-13 6
cookie2 2015-04-14 3
cookie2 2015-04-15 9
cookie2 2015-04-16 7

示例：将所有记录根据cookieid分组，并按pv降序排列，返回组内每行的序号。命令示例如下:

select cookieid, createtime, pv,
       row_number() over (partition by cookieid order by pv desc) as index
from logs;

-- 返回结果：
cookie1 2015-04-12 7 1
cookie1 2015-04-11 5 2
cookie1 2015-04-16 4 3
cookie1 2015-04-15 4 4
cookie1 2015-04-13 3 5
cookie1 2015-04-14 2 6
cookie1 2015-04-10 1 7
cookie2 2015-04-15 9 1
cookie2 2015-04-16 7 2
cookie2 2015-04-13 6 3
cookie2 2015-04-12 5 4
cookie2 2015-04-11 3 5
cookie2 2015-04-14 3 6
cookie2 2015-04-10 2 7

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