SQL Server is Microsoft's premier database product.
System Requirements: Windows 2003 Server, Windows 7 or higher, or Windows Server 2008R2 64-bit.
Express (Free Edition)
- Download SQL Server 2014 Express Edition from Microsoft
Faculty / Staff can purchase using the Microsoft Select Agreement.
Students can get paid editions using Microsoft Dreamspark.
Microsoft SQL: Learning Center
Microsoft SQL: Technical Documentation
Referenced from: Microsoft.com