SQL query courses BrisbaneSQL - Structured Query Language is the standard language for relational databases.  SQL statements are used to perform tasks such as retrieving and updating data on a database. Some common relational database management systems that use SQL are: Oracle, Sybase, Microsoft SQL Server, Access, Ingres, etc. Learn how to use SQL through our hands-on training courses using Microsoft SQL delivered by knowledgeable instructors who speak in plain English.