RingN (geography Data Type)
Applies to:
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Returns the specified ring of the geography instance: 1 ≤ n ≤ NumRings()
.
Syntax
.RingN (expression )
Arguments
expression
Is an int expression between 1 and the number of rings in a polygon instance.
Return Value
SQL Server return type: geography
CLR return type: SqlGeography
Remarks
If the value of the ring index n is less than 1, this method throws an ArgumentOutOfRangeException. The ring index value must be greater than or equal to 1 and should be less than or equal to the number returned by NumRings()
.
Examples
This example creates a Polygon
instance with two rings and returns the second ring.
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.RingN(2).ToString();
See Also
Extended Methods on Geography Instances
NumRings (geography Data Type)