UnionAggregate (geometry Data Type)

Performs a union operation on a set of geometry objects.

Składnia

UnionAggregate ( geometry_operand )

geometry_operand
Is a geometry type table column that holds the set of geometry objects on which to perform a union operation.

SQL Server return type: geometry

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

[!UWAGA]

Method returns null if all inputted values are null.

The following example returns the union of a set of geometry objects in a table variable.

-- Setup table variable for UnionAggregate 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 UnionAggregate on @Geom.shape column

SELECT geometry::UnionAggregate(shape).ToString()

FROM @Geom;