CollectionAggregate (geometry Data Type)

**APPLIES TO:** ![yes](media/yes.png)SQL Server (starting with 2012) ![yes](media/yes.png)Azure SQL Database ![no](media/no.png)Azure SQL Data Warehouse ![no](media/no.png)Parallel Data Warehouse

Creates a GeometryCollection instance from a set of geometry types.

Syntax

  
CollectionAggregate ( geometry_operand )

Arguments

geometry_operand
Is a geometry type table column that represents a set of geometry objects to be listed in the GeometryCollection instance.

Return Types

SQL Server return type: geometry

Exceptions

Throws a FormatException when there are input values that are not valid. See STIsValid (geometry Data Type)

Remarks

Method returns null when the input is empty or the input has different SRIDs. See Spatial Reference Identifiers (SRIDs)

Method ignores null inputs.

[!NOTE]
Method returns null if all inputted values are null.

Examples

The following example returns a GeometryCollection instance that contains a CurvePolygon and a Polygon.

-- Setup table variable for CollectionAggregate example  
DECLARE @Geom TABLE  
(  
shape geometry,  
shapeType nvarchar(50)  
)  
INSERT INTO @Geom(shape,shapeType) VALUES('CURVEPOLYGON(CIRCULARSTRING(2 3, 4 1, 6 3, 4 5, 2 3))', 'Circle'),  
('POLYGON((1 1, 4 1, 4 5, 1 5, 1 1))', 'Rectangle');  
-- Perform CollectionAggregate on @Geom.shape column  
SELECT geometry::CollectionAggregate(shape).ToString()  
FROM @Geom;