Arranging data in a manner that’s meaningful can be a challenge. Sometimes all you need is a simple sort. Often, you need more–you need groups you can analyze and summarize. Fortunately ...

The GROUP BY statement to summarize data is almost as old as SQL itself. Microsoft introduced additional constructs of ROLLUP and CUBE to add power to the GROUP BY clause in SQL Server 6.5 itself.

MAGIC Now let's look at some powerful functions we can use to aggregate and summarize data ... work with additional functions in Spark SQL that can be helpful when presenting data. -- MAGIC Each of ...