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SqlUserDefinedAggregateAttribute.IsNullIfEmpty Property

Indicates whether the aggregate returns null if no values have been accumulated.

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

public bool IsNullIfEmpty { get; set; }

Property Value

Type: System.Boolean
true if the aggregate returns null if no values have been accumulated; otherwise false.

Used by the query processor, this property is true if the aggregate returns null if no values have been accumulated.

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

.NET Framework

Supported in: 4.5.3, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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