| title | NumRings (geography Data Type) | ||
|---|---|---|---|
| description | NumRings (geography Data Type) | ||
| author | MladjoA | ||
| ms.author | mlandzic | ||
| ms.date | 03/14/2017 | ||
| ms.service | sql | ||
| ms.subservice | t-sql | ||
| ms.topic | reference | ||
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| monikerRange | =azuresqldb-current || >=sql-server-2016 || >=sql-server-linux-2017 || =azuresqldb-mi-current || =fabric-sqldb |
[!INCLUDE SQL Server Azure SQL Database Azure SQL Managed Instance FabricSQLDB]
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 ()
[!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();