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Microsoft SQL Server 2005 hotfixes are created for specific SQL Server service packs. You must apply a SQL Server 2005 Service Pack 2 hotfix to an installation of SQL Server 2005 Service Pack 2. By default, any hotfix that is provided in a SQL Server service pack is included in the next SQL Server service pack. Cumulative Update 12 for SQL Server 2005 Service Pack 2 contains hotfixes for SQL Server 2005 Service Pack 2 issues that have been fixed since the release of SQL Server 2005 Service Pack 2. Note This build of the cumulative update package is also known as build 9.00.3315.
http://support.microsoft.com/default.aspx?scid=kb;en-us;962970
Read the complete post at http://wmug.co.uk/blogs/cliffs_blog/archive/2009/02/17/sql-kb-962970-cumulative-update-package-12-for-sql-server-2005-service-pack-2.aspx