EnvelopeAggregate (geometry Data Type)

Returns a bounding box for a given set of geometry objects.

Składnia

EnvelopeAggregate ( geometry_operand )

geometry_operand
Is a geometry type table column that represents the set of geometry objects.

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 a bounding box for a set of objects in a table variable column.

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

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

FROM @Geom;