# The DataFrame API : Transforming Data

- [18. User Defined Function (UDF)](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/18.-user-defined-function-udf.md)
- [17. Apache Spark Architecture : How Apache Spark Transforms data internally](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/17.-apache-spark-architecture-how-apache-spark-transforms-data-internally.md)
- [16. Practice : Business Query 2](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/16.-practice-business-query-2.md)
- [15. Practice : Business Query 1](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/15.-practice-business-query-1.md)
- [14. Aggregation : Grouping data - Part 2](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/14.-aggregation-grouping-data-part-2.md)
- [13. Aggregation : Grouping data - Part 1](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/13.-aggregation-grouping-data-part-1.md)
- [12. Aggregation : Avergage & Mean](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/12.-aggregation-avergage-and-mean.md)
- [11. Aggregation : Get the Sum & SumDistinct](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/11.-aggregation-get-the-sum-and-sumdistinct.md)
- [10. Aggregation : Get the Max Value](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/10.-aggregation-get-the-max-value.md)
- [9.Aggregation : Get the Min Value](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/9.aggregation-get-the-min-value.md)
- [8. Aggregation : Count Distinct](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/8.-aggregation-count-distinct.md)
- [7. Aggregation : Count](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/7.-aggregation-count.md)
- [6. Joining multiple DataFrames : Part2](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/6.-joining-multiple-dataframes-part1.md)
- [5. Joining multiple DataFrames : Part1](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/5.-joining-multiple-dataframes-part1.md)
- [4. Filtering rows from a DataFrame](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/4.-filtering-rows-from-a-dataframe.md)
- [3. Removing columns of a Dataframe](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/3.-removing-columns-of-a-dataframe.md)
- [2. Renaming columns of a DataFrame](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/2.-renaming-columns-of-a-dataframe.md)
- [1. Adding columns to a DataFrame](https://architectures.gitbook.io/project/databricks-fundamentals-and-apache-spark-core/the-dataframe-api-transforming-data/1.-adding-columns-to-a-dataframe.md)


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