PySpark Select First Row of Each Group?

In PySpark select/find the first row of each group within a DataFrame can be get by grouping the data using window partitionBy() function and running row_number() function over window partition. let's see with an example. 1. Prepare Data & DataFrame Before we start let's create the PySpark DataFrame with 3…

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Spark SQL – Add row number to DataFrame

The row_number() is a window function in Spark SQL that assigns a row number (sequential integer number) to each row in the result DataFrame. This function is used with Window.partitionBy() which partitions the data into windows frames and orderBy() clause to sort the rows in each partition. Preparing a Data set Let's…

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Spark DataFrame Select First Row of Each Group?

In this Spark article, I've explained how to select/get the first row, min (minimum), max (maximum) of each group in DataFrame using Spark SQL window functions and Scala example. Though I've explained here with Scala, the same method could be used to working with PySpark and Python. 1. Preparing Data…

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