(select *, row_number() over (partition by 要分组的列名 order by 要排序的列名 desc) as ranking from 表名) as a where rangking<=N; 1. 2. 3. 4. 4.聚合函数作为窗口函数 聚合函数作为窗口函数和专用窗口函数用法相同,只需要把聚合函数写在窗口函数的位置即可,但聚合函数括号里不能为空,必须写...
5、将中中间过程落hive表,再row_number 6、原因排查 1、问题描述 根据uuid、dlb_file_name_key、frame_num分区,根据distance排序。 row_number() over(partition by uuid,dlb_file_name_key,frame_num order by distance) rank 当使用spark默认引擎的时候,会出现分区错误的情况。
a,row_number()over(partition by a order by b desc)asrn from testdata2 上面的语句主要分两部分 window函数部分(row_number) 窗口定义部分(over) 代码语言:javascript 复制 select a,row_number()over(partition by a order by b desc)asrn from testdata2---unresolved logical plan---'Project ['a,...
①.row_number() over(partition by X1 order by X2 ) as rank 对表中的数据按照X1分组,按照X2排序,对每个分组内的数据标号,每个分组内的 标号是连续的,标号在每个分组内从1开始。 session.sql( """ | select | riqi,leibie,jine,row_number() over(partition by leibie order by jine desc ) as ...
select a, row_number() over wd as rn, sum(1) over wd as num from testdata2 window wd as(partition by a order by b desc) vs select a, row_number() over(partition by a order by b desc ) as rn, sum(1) over(partition by a order by b desc) as num from testdata...
//row_number()开窗函数的语法说明 //首先可以在select查询时,使用row_number()函数 //其次,row_number()函数后面先跟上over关键字 //然后括号中是partition by也就是根据哪个字段进行分组 //其次是可以用order by进行组内排序 //然后row_number()就可以给每个组内的行,一个组内行号 ...
sql.window import Window F.row_number().over( Window.partitionBy("driver").orderBy(col("unit_count").desc()) ) 或独立功能: from pyspark.sql.functions import desc from pyspark.sql.window import Window F.row_number().over( Window.partitionBy("driver").orderBy(desc("unit_count")) ) ...
一、rank() over(partition by ...order by) 解释:partition by用于给结果集分组,如果没有指定那么它把整个结果集作为一个分组。二、语法:ROW_NUMBER() OVER(PARTITION BY COLUMN ORDER BY COLUMN) 解释:partition...
业务中需要实现频控功能, 类似于row_number() over(partition by logid order by log_timestamp desc) rank这种, 将相同维度数据放到同一partition然后进行分组排序. 原数据是DataFrame 2. SQL版本 使用Spark Sql实现: defsparkSqlFunc(testDf:DataFrame){testDf.createOrReplaceTempView("test_view")val sql=""...
row_number() over(order by score) as rownum 表示按score 升序的方式来排序,并得出排序结果的序号 注意: 在排序开窗函数中使用 PARTITION BY 子句需要放置在ORDER BY 子句之前。 示例1 代码语言:javascript 复制 spark.sql("select name, class, score, row_number() over(partition by class order by score...