SQL and SQL-based relational databases are one of the most important foundation technologies of the computer market today.

From its first commercial implementation about four decades ago, SQL has grown to become the standard database language.

In its first decade, the backing of IBM, the blessing of standards bodies ANSI and ISO, and the enthusiastic support of DBMS vendors made SQL a dominant standard for enterprise-class data management.

In its second decade, the dominance of SQL extended to personal computer and workgroup environments and to new, database-driven market segments, such as data warehousing.

In the early part of its third decade, SQL stands as the standard database technology for Internet-based computing.

Now the market evidence clearly shows the importance of SQL. Therefore the SQL is an open language, and it works with IBM, Oracle, Teradata, Microsoft SQL server and Sybase, and lot more, the fundamentals of SQL are almost equal across all the data base vendors.