Microsoft SQL Server is a Relational Database Management System(RDBMS) developed by Microsoft. It is one of the most popular RDBMS. SQL server has evolved from sql 1.0 in 1989 to the latest release of SQL Server 2019 (preview) to become one of the best enterprise level database server's. SQL server is released with different editions. Express: Free to use entry level database which can use 1 core cpu, 1 GB ram and have maximum size of 10GB. Compact : Free embedded database for mobile app development and can have maximum size of 4GB. Enterprise : Full featured top end edition. Standard : Have less features than enterprise. WorkGroup: suitable for a company to use among the group. Developer: Same features like enterprise but is licensed to one user only. Web: Specially targeted for web application There are some other editions like Datacenter, Enterprise evaluation and Business Intelligence. These all editions are not available on all version o...