VistaDB 6
VistaDB / Developer's Guide / CLR Stored Procedures and Functions / Technical Details of CLR Procs and Functions / CLR Aggregate Functions
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    CLR Aggregate Functions
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    Functions that are to be used as aggregates must have the following attribute on their function declaration.

    [VistaDBClrProcedure( Kind=VistaDBClrProcedureKind.Aggregate)]

    This identifies the CLR Procedure as a special type of procedure known as an aggregate that can be used for aggregate operations in SQL statements.