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STIsSimple (geometry Data Type)

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Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric

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.

Syntax

  
.STIsSimple ( )

Note

To view Transact-SQL syntax for SQL Server 2014 (12.x) and earlier versions, see Previous versions documentation.

Return Types

SQL Server return type: bit

CLR return type: SqlBoolean

Remarks

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.

Examples

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();

See Also

OGC Methods on Geometry Instances