SQL – or Structured Query Language – might not carry the same flashy reputation as headline-stealing Python or the seemingly omnipotent Java, but there's a reason it remains near the very top ...

In R, the sqldf package lets you run SQL queries on an R data frame, and that’s what I’ll use in this example. There’s a similar sqldf library in Python.

Data science and machine learning professionals have driven adoption of the Python programming language, but data science and machine learning are still lacking key tools in business and has room ...