38. user defined function in pyspark | UDF(user defined function) in PySpark | Azure Databricks

Azure Databricks #spark #pyspark #azuredatabricks #azure In this video, I discussed How to use user defined function (udf). 1.schema comparison in pyspark 2. How to user defined function (udf) in pyspark Create dataframe: ====================================================== data1=[(1,"Ram","Male",100),(2,"Radhe","Female",200),(3,"John","Male",250)] data2=[(101,"John","Male",100),(102,"Joanne","Female",250),(103,"Smith","Male",250)] data3=[(1001,"Maxwell","IT",200),(2,"MSD","HR",350),(3,"Virat","IT",300)] schema1=["Id","Name","Gender","Salary"] schema2=["Id","Name","Gender","Salary"] schema3=["Id","Name","DeptName","Salary"] df1=spark.createDataFrame(data1,schema1) df2=spark.createDataFrame(data2,schema2) df3=spark.createDataFrame(data3,schema3) display(df1) display(df2) display(df3) ----------------------------------------------------------------------------------------------------------------------- def schemacompare(df1,df2): allcol=df1.columns+df2.columns uniquecol=list(set(allcol)) for i in uniquecol: from pyspark.sql.functions import lit if i not in df1.columns: df1=df1.withColumn(i,lit(None)) if i not in df2.columns: df2=df2.withColumn(i,lit(None)) return df1,df2 --------------------------------------------------------------------------------------------------------------------- df1,df2=schemacompare(df1,df3) display(df1) display(df2) ------------------------------------------------------------------------------------------------------------------- ============================================================ 37. schema comparison in pyspark | How to Compare Two DataFrames in PySpark | pyspark interview: https://youtu.be/OGJWwJ6VqOQ Learn PySpark, an interface for Apache Spark in Python. PySpark is often used for large-scale data processing and machine learning. Azure Databricks Tutorial Platlist: https://youtube.com/playlist?list=PLNRxk1s77zfgubs75vVMzHhPIhWqRo79C Azure data factory tutorial playlist: https://youtube.com/playlist?list=PLNRxk1s77zfjX_3ktp5sKsOh4Q2cWMMDX ADF interview question & answer: https://youtube.com/playlist?list=PLNRxk1s77zfgXfQKyScXtbn2MdFkvJtgH 1. pyspark introduction | pyspark tutorial for beginners | pyspark tutorial for data engineers: https://youtu.be/hBDLfBILAuQ 2. what is dataframe in pyspark | dataframe in azure databricks | pyspark tutorial for data engineer: https://youtu.be/VNNlNlVKn98 3. How to read write csv file in PySpark | Databricks Tutorial | pyspark tutorial for data engineer: https://youtu.be/9kwxwCww4zI 4. Different types of write modes in Dataframe using PySpark | pyspark tutorial for data engineers: https://youtu.be/-0_LkRtD3Bo 5. read data from parquet file in pyspark | write data to parquet file in pyspark: https://youtu.be/B6wrbfLbaX0 6. datatypes in PySpark | pyspark data types | pyspark tutorial for beginners: https://youtu.be/LqTUjOOHwQU 7. how to define the schema in pyspark | structtype & structfield in pyspark | Pyspark tutorial: https://youtu.be/SqDlX_B7NmI 8. how to read CSV file using PySpark | How to read csv file with schema option in pyspark: https://youtu.be/s1HHtTVg9xU 9. read json file in pyspark | read nested json file in pyspark | read multiline json file: https://youtu.be/dOkPf_zVqaw 10. add, modify, rename and drop columns in dataframe | withcolumn and withcolumnrename in pyspark: https://youtu.be/2SzrgwVhsy0 11. filter in pyspark | how to filter dataframe using like operator | like in pyspark: https://youtu.be/4Hk8xmDPFZA 12. startswith in pyspark | endswith in pyspark | contains in pyspark | pyspark tutorial: https://youtu.be/8Bep9kk4JB8 13. isin in pyspark and not isin in pyspark | in and not in in pyspark | pyspark tutorial: https://youtu.be/bY86Et-uIcA 14. select in PySpark | alias in pyspark | azure Databricks #spark #pyspark #azuredatabricks #azure https://youtu.be/Ih9IlDO63CY 15. when in pyspark | otherwise in pyspark | alias in pyspark | case statement in pyspark: https://youtu.be/d1GVRCXZ64o 16. Null handling in pySpark DataFrame | isNull function in pyspark | isNotNull function in pyspark: https://youtu.be/si4bhjK1uB8 17. fill() & fillna() functions in PySpark | how to replace null values in pyspark | Azure Databrick: https://youtu.be/OgAry0H_P9c 18. GroupBy function in PySpark | agg function in pyspark | aggregate function in pyspark: https://youtu.be/_IaHywzYYFc 19. count function in pyspark | countDistinct function in pyspark | pyspark tutorial for beginners: https://youtu.be/wDNSgMkkwPM 20. orderBy in pyspark | sort in pyspark | difference between orderby and sort in pyspark: https://youtu.be/L3d6Eaxurz0 21. distinct and dropduplicates in pyspark | how to remove duplicate in pyspark | pyspark tutorial: https://youtu.be/HY54i2m4C0M