Delen via

SqlUserDefinedAggregateAttribute.IsInvariantToDuplicates 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 duplicates.

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

Property Value

Boolean

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

Remarks

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.

Applies to