
        
        
            
                
                
                    df = spark.createDataFrame([["Alex", 25], ["Bob", 30], ["Alex", 25], ["Alex", 50]], ["name", "age"])
df.show()
                
            
            +----+---+
|name|age|
+----+---+
|Alex| 25|
| Bob| 30|
|Alex| 25|
|Alex| 50|
+----+---+

Counting the number of distinct values in single PySpark column

To count the number of distinct rows in the column name:


        
        
            
                
                
                    import pyspark.sql.functions as F
df.select(F.countDistinct("name")).show()
                
            
            +--------------------+
|count(DISTINCT name)|
+--------------------+
|                   2|
+--------------------+

Note that instead of passing in the column label ("name"), you can pass in a Column object like so:


        
        
            
                
                
                    # df.select(F.countDistinct(df.name)).show()
df.select(F.countDistinct(F.col("name"))).show()
                
            
            +--------------------+
|count(DISTINCT name)|
+--------------------+
|                   2|
+--------------------+

Counting the number of distinct values in multiple PySpark columns

To consider the columns name and age when counting duplicate rows:


        
        
            
                
                
                    df.select(F.countDistinct("name", "age")).show()
                
            
            +-------------------------+
|count(DISTINCT name, age)|
+-------------------------+
|                        3|
+-------------------------+

Counting the number of distinct rows in PySpark DataFrame

To consider all columns when counting duplicate rows, pass in "*":


        
        
            
                
                
                    df.select(F.countDistinct("*")).show()
                
            
            +-------------------------+
|count(DISTINCT name, age)|
+-------------------------+
|                        3|
+-------------------------+

Published by Isshin Inada

Edited by 0 others

Did you find this page useful?

thumb_up

thumb_down

Comment

Citation

Ask a question or leave a feedback...

Official PySpark Documentation

https://spark.apache.org/docs/latest/api/python/reference/api/pyspark.sql.functions.countDistinct.html

thumb_up

thumb_down

chat_bubble_outline

settings

Enjoy our search

Hit / to insta-search docs and recipes!