原文：http://www.microsoft.com/sql/prodinfo/features/compare-features.mspx

Microsoft has redesigned the SQL Server 2005 product family to better meet the needs of specific customer segments by introducing four new editions: Express, Workgroup, Standard, and Enterprise.

These new editions offer a range of features?from high availability and scalability to advanced business intelligence tools?designed to empower users across an organization. As a low-cost mainstream database, SQL Server 2005 delivers unprecedented value and functionality compared with competitive solutions. For demanding enterprise systems, SQL Server 2005 represents a dramatic step forward, with reduced application downtime, and high scalability and performance, and tight security-related controls.

Because SQL Server is part of the Windows Server System, customers gain the benefits of reduced total cost of ownership and faster development time. This is due to the increased manageability and integration resulting from the common engineering strategy implemented across Windows Server System products.

The table below presents details about each of the editions. Not included in the table are SQL Server Developer and Evaluation editions; these editions have the same features as the SQL Server Enterprise but have different licensing policies.