SQL also known as SEQUEL, the American national Standdards Institute (ANSI) adopts it as a standard in 1986. SQL is a simple query language that is use to access the relational databases. Although SQL is a standard, every vendor may implement his or her own version of the SQL language. From time to time, some command may differ from one vendor to another. In this section, you will learn the basic use of the standard SQL command. The best way for you to learn SQL is to install a database on your computer and try out the SQL command as you go along.