18 Useful Important SQL Functions to Learn ASAP by Aldo Zelen 5 Jan 2018 Beginning with SQL: Useful Functions to Master Learning a new programming 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 useful SQL functions that you need to know. There are many useful SQL functions for working with different data types. Once you practice with some of the most common ones, you'll gain enough confidence to move on to more advanced material. Read more