MySQL is most widely used relational database management system for developing web applications. MySQL is open source RDBMS use SQL (Structured Query Language) for managing, adding, accessing data and runs on various operating such as Windows, Linux and OS X, etc.
The Oracle database is also known as object relational database management system is used by mid to large size organizations to manage information. Oracle database is assortment of data and allow users to store and retrieve related data from SQL queries.
MS Access database is one of the Microsoft office suit tool that used to manage data for reporting, analysis. Simple and easy to use Microsoft access database is used by developers to create software application.
SQL server is a relational database management system created by Microsoft and main query language are T-SQL and ANSI SQL. SQL stand for Structure Query Language is used to managing the database,updating the database and retrieving the data from database.