SQL database is a type of database technology that is the most widely used in today's computing environment. Here the data is stored in a very structured format that provides high levels of functionality. SQL databases are generally more robust, secure and have better performance than other older database technologies. It provides for 'SQL' access to the data. So it is important to understand the term SQL before we proceed further.
What is SQL?
SQL pronounced either as "sequel" or "seekel" is an acronym for Structured Query Language, a language developed by IBM Corporation for processing data contained in mainframe computer databases. The relational model from which SQL draws much of its conceptual core was formally defined in 1970 by Dr. E. F. Codd, a researcher for IBM in his paper titled "A Relational Model of Data for Large Shared Data Banks".
SQL is used to create, maintain & query relational databases and uses regular English words for many of its commands, which makes it easy to use. It is often embedded within other programming languages. A fundamental difference between SQL and standard programming languages is that SQL is declarative.
Major SQL Databases
SQL databases can now be classified under two headings like SQL databases that are purely relational and a combination of both Object and Relational.
Major RDBMSes
