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SqlUserDefinedAggregateAttribute::IsInvariantToDuplicates Property

Indicates whether the aggregate is invariant to duplicates.

Namespace:  Microsoft.SqlServer.Server
Assembly:  System.Data (in System.Data.dll)

public:
property bool IsInvariantToDuplicates {
	bool get ();
	void set (bool value);
}

Property Value

Type: System::Boolean
true if the aggregate is invariant to duplicates; otherwise false.

Used by the query processor, this property is true if the aggregate is invariant to duplicates. That is, the aggregate of S, {X} is the same as aggregate of S when X is already in S. For example, aggregate functions such as MIN and MAX satisfy this property, while SUM does not.

Incorrectly setting this property can result in incorrect query results. This property is not an optimizer hint; it affects both the plan selected and the results returned by the query.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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