Update README.md

bekisz · Oct 19, 2020 · dd9bfca · dd9bfca
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@@ -19,30 +19,25 @@ Explanation of all Spark SQL, RDD, DataFrame and Dataset examples present on thi
   - [Spark Accumulators Explained](https://sparkbyexamples.com/spark/spark-accumulators/)
   - [Convert Spark RDD to DataFrame | Dataset](https://sparkbyexamples.com/apache-spark-rdd/convert-spark-rdd-to-dataframe-dataset/)
 
-## Spark DataFrame Examples 
-  - [Creating Spark DataFrame example](https://sparkbyexamples.com/spark/different-ways-to-create-a-spark-dataframe/)
-  - [Creating empty DataFrame example](https://sparkbyexamples.com/spark/spark-how-to-create-an-empty-dataframe/)
-  - [Working with Spark DataFrame column](https://sparkbyexamples.com/spark/spark-dataframe-withcolumn/)
-  - [Renaming Spark DataFrame column](https://sparkbyexamples.com/spark/rename-a-column-on-spark-dataframes/)
-  - [Spark SQL Schema with StructType & StructField](https://sparkbyexamples.com/spark/spark-sql-structtype-on-dataframe/)
-  - [Spark Case When and When Otherwise example](https://sparkbyexamples.com/spark/spark-case-when-otherwise-example/)
-  - [DataFrame Transpose - Pivoting & Unpoting DataFrame](https://sparkbyexamples.com/spark/how-to-pivot-table-and-unpivot-a-spark-dataframe/)
-  - [DataFrame Array column](https://sparkbyexamples.com/spark/spark-array-arraytype-dataframe-column/)
-  - [DataFrame Map column](https://sparkbyexamples.com/spark/spark-dataframe-map-maptype-column/)
+## Spark SQL Tutorial
+  - [Spark Create DataFrame with Examples](https://sparkbyexamples.com/spark/different-ways-to-create-a-spark-dataframe/)
+  - [Spark DataFrame withColumn](https://sparkbyexamples.com/spark/spark-dataframe-withcolumn/)
+  - [Ways to Rename column on Spark DataFrame](https://sparkbyexamples.com/spark/rename-a-column-on-spark-dataframes/)
+  - [Spark – How to Drop a DataFrame/Dataset column](https://sparkbyexamples.com/spark/spark-drop-column-from-dataframe-dataset/)
+  - [Working with Spark DataFrame Where Filter](https://sparkbyexamples.com/spark/spark-dataframe-where-filter/)
+  - [Spark SQL “case when” and “when otherwise”](https://sparkbyexamples.com/spark/spark-case-when-otherwise-example/)
+  - [Collect() – Retrieve data from Spark RDD/DataFrame](https://sparkbyexamples.com/spark/spark-dataframe-collect/)
+  - [Spark – How to remove duplicate rows](https://sparkbyexamples.com/spark/spark-remove-duplicate-rows/)
+  - [How to Pivot and Unpivot a Spark DataFrame](https://sparkbyexamples.com/spark/how-to-pivot-table-and-unpivot-a-spark-dataframe/)
+  - [Spark SQL Data Types with Examples](https://sparkbyexamples.com/spark/spark-sql-dataframe-data-types/)
+  - [Spark SQL StructType & StructField with examples](https://sparkbyexamples.com/spark/spark-sql-structtype-on-dataframe/)
+  - [Spark schema – explained with examples](https://sparkbyexamples.com/spark/spark-schema-explained-with-examples/)
+  - [Spark Groupby Example with DataFrame](https://sparkbyexamples.com/spark/using-groupby-on-dataframe/)
+  - [Spark – How to Sort DataFrame column explained](https://sparkbyexamples.com/spark/spark-how-to-sort-dataframe-column-explained/)
+  - [Spark SQL Join Types with examples](https://sparkbyexamples.com/spark/spark-sql-dataframe-join/)
+  - [Spark DataFrame Union and UnionAll](https://sparkbyexamples.com/spark/spark-dataframe-union-and-union-all/)
+  - [Spark map vs mapPartitions transformation](https://sparkbyexamples.com/spark/spark-map-vs-mappartitions-transformation/)
+  - [Spark foreachPartition vs foreach | what to use?](https://sparkbyexamples.com/spark/spark-foreachpartition-vs-foreach-explained/)
+  - [Spark DataFrame Cache and Persist Explained](https://sparkbyexamples.com/spark/spark-dataframe-cache-and-persist-explained/)
+  - []()
 
-## Spark SQL Functions Examples
-  - [Spark SQL String Functions](https://sparkbyexamples.com/spark/usage-of-spark-sql-string-functions/)
-  - [Spark SQL Array Functions](https://sparkbyexamples.com/spark/spark-sql-array-functions/)
-  - [Spark SQL map Functions](https://sparkbyexamples.com/spark/spark-sql-map-functions/)
-  - [Spark SQL Date & Time Functions](https://sparkbyexamples.com/spark/spark-sql-date-and-time-functions/)
-  - [Spark SQL Sort Functions](https://sparkbyexamples.com/spark/spark-sql-sort-functions/)
-
-## Spark Datasource Examples
-  - [Spark Accessing Parquet file example ](https://sparkbyexamples.com/spark/spark-read-write-dataframe-parquet-example/)
-  - [Spark Accessing XML file example](https://sparkbyexamples.com/spark/processing-xml-files-in-spark/)
-  - [Spark Accessing Avro example](https://sparkbyexamples.com/spark/read-write-avro-file-spark-dataframe/)
-  - [Spark Accessing HBase using hbase-spark connector](https://sparkbyexamples.com/spark/spark-read-write-using-hbase-spark-connector/)
-  - [Spark Accessing HBase using hortonworks connector](https://sparkbyexamples.com/spark/create-spark-dataframe-from-hbase-using-hortonworks/)
-
-## Spark Dataset Examples
-