Hive / SQL 查询每个键的前 n 个值
Hive / SQL query for top n values per key
我想要每个键的前 2 个值。结果如下：
配置单元查询应该是什么。
您可以使用 window function with OVER() 关闭：
select col1,col2 from (SELECT col1,
col2,
ROW_NUMBER() OVER (PARTITION BY col1 ORDER BY col2 DESC) AS row_num
FROM data)f
WHERE f.row_num < 3
order by col1,col2
我想要每个键的前 2 个值。结果如下：
配置单元查询应该是什么。
您可以使用 window function with OVER() 关闭：
select col1,col2 from (SELECT col1,
col2,
ROW_NUMBER() OVER (PARTITION BY col1 ORDER BY col2 DESC) AS row_num
FROM data)f
WHERE f.row_num < 3
order by col1,col2