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.
Applies to: SQL Server (SQL Server 2012 through current version), Azure SQL Database.
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();