FIX: Error message when you run a DELETE statement from a table that contains a nonclustered primary key in SQL Server 2005: "Internal Query Processor Error: The query processor could not produce a query plan"
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Source: Knowledge Base
Product: Microsoft SQL Server 2005 Enterprise Edition, SQL Server 2005 Standard Edition & SQL Server 2005 Enterprise X64 Edition
Notification Contents: New
FIX: Error message when you run a DELETE statement from a table that contains a nonclustered primary key in SQL Server 2005: "Internal Query Processor Error: The query processor could not produce a query plan"
http://support.microsoft.com/kb/953854/en-US