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The full version of this post can be found here., http://sqlblogcasts.com/blogs/simons/SQL Engine - BULK UPDATE command
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You can achieve very high performance with the BULK INSERT interfaces in SQL Server 2005, from SSIS, ADO, TSQL or plain old bcp.
Many times you would like to be able to perform bulk updates with the same performance, however there is no command to support this.
... To read the complete version of this post go here, http://sqlblogcasts.com/blogs/simons/SQL Engine - BULK UPDATE command