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# STIsSimple (geometry Data Type)

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.

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.

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