Microsoft SQL Server 2005 includes a component named SQL CLR ('Common Language Runtime') via which it integrates with.NET Framework. Unlike most other applications.
SQL Server offers the right editions to meet your needs, including Enterprise, Business Intelligence, Standard and Express.
Next, you'll need to download the appropriate installer file for the version of SQL Server 2012 Express Edition that best suits your operating system and needs.
SQL Server offers the right editions to meet your needs, including Enterprise, Business Intelligence, Standard and Express.
Microsoft® SQL Server® 2012 Express is a powerful and reliable free data management system that delivers a rich and reliable data store for lightweight Web Sites.
From Microsoft: Microsoft SQL Server 2008 Express (64-bit) is a powerful and reliable data management system that delivers a rich set of features, data protection.
SQL Server 2008 Express Edition is a free, easy-to-use, lightweight, and embeddable version of SQL Server 2008. Free to download, free to redistribute, free to embed.

Microsoft SQL Server Management Studio Express (SSMSE) is a free, easy-to-use graphical management tool for managing SQL Server 2005 Express Edition and SQL Server.