Microsoft SQL Server 2012 Express with SP1 are a free, feature-rich editions of SQL Server that is ideal for learning, developing, powering desktop, web & small server applications, and for redistribution by ISVs. The SQL Server 2012 SP1 Express release includes the full version of SQL Server 2012 Management Studio with SP1 instead of SQL Server 2012 Management Studio Express. For a complete list of supported features in SQL Server Management Studio, see Features in SQL Server Management Studio.
LocalDB (MSI installer)：New to the Express family, LocalDB is a lightweight version of Express that has all its programmability features, yet runs in user mode and has a fast, zero-configuration installation and short list of pre-requisites. Use this if you need a simple way to create and work with databases from code. It can be bundled with Application and Database Development tools like Visual Studio and or embedded with an application that needs local databases.
Express (Containing only the database engine)：The core Express database server. Use this if you need to accept remote connections or administer remotely.
Express with Tools (with LocalDB) Includes the database engine and SQL Server Management Studio Express)：This package contains everything needed to install and configure SQL Server as a database server. Choose either LocalDB or Express depending on your needs above.
SQL Server Management Studio Express (Tools only)：This does not contain the database, but only the tools to manage SQL Server instances, including LocalDB, SQL Express, SQL Azure, etc. Use this if you already have the database and only need the management tools. This package includes LocalDB.
Express with Advanced Services (contains the database engine, Express Tools, Reporting Services, and Full Text Search)：This package contains all the components of SQL Express. This is a larger download than “with Tools,” as it also includes both Full Text Search and Reporting Services.
Supported Operating Systems: Windows 7, Windows Server 2008 R2, Windows Server 2008 Service Pack 2, Windows Vista Service Pack 2
Computer with Intel or compatible 1GHz or faster processor (2 GHz or faster is recommended.)
1.4 GHz or faster processor
Minimum of 512 MB of RAM (2 GB or more is recommended.)
2.2 GB of available hard disk space
Microsoft SQL Server 2012 Express SP 2 ENG X64
Microsoft SQL Server 2012 Express SP2 ENG X86
Microsoft SQL Server 2012 Express SP2 简中 X64
Microsoft SQL Server 2012 Express SP2 简中 X86