CollectionAggregate (geography Data Type)
Creates a GeometryCollection instance from a set of geography objects.
|Applies to: SQL Server (SQL Server 2012 through current version), Azure SQL Database.|
ConvexHullAggregate ( geography_operand )
Is a geography type table column that represents a set of geography objects to be listed in the GeometryCollection instance.
SQL Server return type: geography
FormatException when there are input values that are not valid. See STIsValid (geography Data Type)
Method returns null when the input is empty or the input has different SRIDs. See Spatial Reference Identifiers (SRIDs)
Method ignores null inputs.
The following example returns a
GeometryCollection instance that contains a set of geography objects.
SELECT geography::CollectionAggregate(SpatialLocation).ToString() AS SpatialLocation
WHERE City LIKE ('Bothell')