Except that "ETL" is a terrible name for it: one of those generic acronyms, that even when expanded to "Extract, Transform, Load", needs explanation for at leas

Except that "ETL" is a terrible name for it: one of those generic acronyms, that even when expanded to "Extract, Transform, Load", needs explanation for at least the "E" and "L" parts. To me, looking at it as "functional" approach instead (data in, operate over that data, data out) is cognitively simpler.