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STBoundary (geometry Data Type)

Applies To: SQL Server 2014, SQL Server 2016 Preview

Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).

Returns the boundary of a geometry instance.

.STBoundary ( )

SQL Server return type: geometry

CLR return type: SqlGeometry

STBoundary() returns an empty GeometryCollection when the endpoints for a LineString, CircularString, or CompoundCurve instance are the same.

A. Using STBoundary() on a LineString instance with different endpoints

The following example creates a LineString geometry instance. STBoundary() returns the boundary of the LineString.

DECLARE @g geometry;
SET @g = geometry::STGeomFromText('LINESTRING(0 0, 2 2, 0 2, 2 0)', 0);
SELECT @g.STBoundary().ToString();

B. Using STBoundary() on a LineString instance with the same endpoints

The following example creates a valid LineString instance with the same endpoints. STBoundary() returns an empty GeometryCollection.

DECLARE @g geometry;

SET @g = geometry::STGeomFromText('LINESTRING(0 0, 2 2, 0 2, -2 2, 0 0)', 0);

SELECT @g.STBoundary().ToString();

C. Using STBoundary() on a CurvePolygon instance

The following example uses STBoundary() on a CurvePolygon instance. STBoundary() returns a CircularString instance.

DECLARE @g geometry;

SET @g = geometry::STGeomFromText('CURVEPOLYGON(CIRCULARSTRING(0 0, 2 2, 0 2, -2 2, 0 0))', 0);

SELECT @g.STBoundary().ToString();

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