SqlUserDefinedAggregateAttribute.IsInvariantToNulls Property

  • Reference

Definition

Namespace:
Microsoft.SqlServer.Server
Assembly:
System.Data.SqlClient.dll
Assembly:
System.Data.dll
Assembly:
Microsoft.SqlServer.Server.dll
Package:
System.Data.SqlClient v4.8.5
Package:
Microsoft.SqlServer.Server v1.0.0

Indicates whether the aggregate is invariant to nulls.

public:
 property bool IsInvariantToNulls { bool get(); void set(bool value); };
public bool IsInvariantToNulls { get; set; }
member this.IsInvariantToNulls : bool with get, set
Public Property IsInvariantToNulls As Boolean

Property Value

Boolean

true if the aggregate is invariant to nulls; otherwise false.

Remarks

Used by the query processor, this property is true if the aggregate is invariant to nulls. That is, the aggregate of S, {NULL} is the same as aggregate of S. For example, aggregate functions such as MIN and MAX satisfy this property, while COUNT(*) does not.

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.

Applies to