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geometry (Transact-SQL)
geometry Data Type Method Reference
OGC Methods on Geometry Instances
STArea (geometry Data Type)
STAsBinary (geometry Data Type)
STAsText (geometry Data Type)
STBoundary (geometry Data Type)
STBuffer (geometry Data Type)
STCentroid (geometry Data Type)
STContains (geometry Data Type)
STConvexHull (geometry Data Type)
STCrosses (geometry Data Type)
STDifference (geometry Data Type)
STDimension (geometry Data Type)
STDisjoint (geometry Data Type)
STDistance (geometry Data Type)
STEndpoint (geometry Data Type)
STEnvelope (geometry Data Type)
STEquals (geometry Data Type)
STExteriorRing (geometry Data Type)
STGeometryN (geometry Data Type)
STGeometryType (geometry Data Type)
STInteriorRingN (geometry Data Type)
STIntersection (geometry Data Type)
STIntersects (geometry Data Type)
STIsClosed (geometry Data Type)
STIsEmpty (geometry Data Type)
STIsRing (geometry Data Type)
STIsSimple (geometry Data Type)
STIsValid (geometry Data Type)
STLength (geometry Data Type)
STNumGeometries (geometry Data Type)
STNumInteriorRing (geometry Data Type)
STNumPoints (geometry Data Type)
STOverlaps (geometry Data Type)
STPointN (geometry Data Type)
STPointOnSurface (geometry Data Type)
STRelate (geometry Data Type)
STSrid (geometry Data Type)
STStartPoint (geometry Data Type)
STSymDifference (geometry Data Type)
STTouches (geometry Data Type)
STUnion (geometry Data Type)
STWithin (geometry Data Type)
STX (geometry Data Type)
STY (geometry Data Type)
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STIsSimple (geometry Data Type)

SQL Server 2008

Returns 1 if a geometry instance is simple, as defined by the Open Geospatial Consortium (OGC). Returns 0 if a geometry instance is not simple.

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.STIsSimple ( )

SQL Server return type: bit

CLR return type: SqlBoolean

To be simple, a geometry instance must meet all of the following requirements:

  • Each figure of the instance must not intersect itself, except at its endpoints.

  • No two figures of the instance can intersect each other at a point that is not in both of their boundaries.

The following example creates a nonsimple LineString instance that intersects itself and uses STIsSimple() to test whether the LineString is simple.

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