STIsSimple (geometry Data Type)
Applies To: SQL Server 2014, SQL Server 2016 Preview
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.
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();