| title | description | author | ms.author | ms.date | ms.service | ms.subservice | ms.topic | f1_keywords | helpviewer_keywords | dev_langs | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
NumRings (geography Data Type) |
NumRings (geography Data Type) |
MladjoA |
mlandzic |
03/14/2017 |
sql |
t-sql |
reference |
|
|
|
[!INCLUDE SQL Server Azure SQL Database Azure SQL Managed Instance]
Returns the total number of rings in a Polygon instance. In the [!INCLUDEssNoVersion] geography type, external and internal rings are not distinguished, as any ring can be taken to be the external ring.
.NumRings ()
[!INCLUDEsql-server-tsql-previous-offline-documentation]
[!INCLUDEssNoVersion] return type: int
CLR return type: SqlInt32
This method will return NULL if this is not a Polygon instance and will return 0 if the instance is empty. This method is precise.
This example creates a Polygon instance with two rings and confirms that it has two rings.
DECLARE @g geography;
SET @g = geography::STGeomFromText('POLYGON((-122.358 47.653, -122.348 47.649, -122.348 47.658, -122.358 47.658, -122.358 47.653), (-122.357 47.654, -122.357 47.657, -122.349 47.657, -122.349 47.650, -122.357 47.654))', 4326);
SELECT @g.NumRings();