Mastering the basics for a smooth start to SQL Learning a new programing language can seem intimidating. Like any other language, a programming language has a large vocabulary that you need to master. In this article, we’ll look at some of the most important SQL functions that you need to know. SQL is a rich language with many useful functions for working with different data types. Once you practice with some of the most important SQL functions, you’ll gain enough confidence to move on to more advanced material.