![Jedi SAS Tricks: Explicit SQL Pass-through in DS2 Results of DS2 BY processing without pre-sorting the data](https://blogs.sas.com/content/sastraining/files/2016/07/Jedi_DS2_by_Figure1.png)
One of the things I’ve come to love most about DS2 is the tight integration with SQL which makes so many data prep chores so much less onerous. An example is DATA program BY group processing. With a traditional DATA step, you must first sort or index the source data