STNumInteriorRing (geometry Data Type)

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

Returns the number of interior rings of a Polygongeometry instance.


.STNumInteriorRing ( )  


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

Return Types

SQL Server return type: int

CLR return type: SqlInt32


This method returns null if the geometry instance is not a polygon.


The following example creates a Polygon instance and uses STNumInteriorRing() to find how many interior rings the instance has.

DECLARE @g geometry;  
SET @g = geometry::STGeomFromText('POLYGON((0 0, 3 0, 3 3, 0 3, 0 0),(2 2, 2 1, 1 1, 1 2, 2 2))', 0);  
SELECT @g.STNumInteriorRing();  

See Also

OGC Methods on Geometry Instances