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: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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