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RingN (geography Data Type)

Returns the specified ring of the geography instance: 1 ≤ n ≤ NumRings().

Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database.

.RingN (expression )

expression

Is an int expression between 1 and the number of rings in a polygon instance.

SQL Server return type: geography

CLR return type: SqlGeography

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().

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();

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