Hi: We will ask the course instructors to comment on your question and post a response back.
Cynthia
Followup: One of the instructors said:
"It would help to know what node in a data job they are inquiring about.
There is an SQL Query node where you get to specify your own SQL code (for the selected data source)."
So if you have any more specific information about a usage scenario or what specific node you are asking about, that would be useful information.
Thanks.