STGeometryN (geography Data Type)

Article
02/28/2023

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance

Returns a specified geography element in a GeometryCollection or one of its subtypes. When STGeometryN() is used on a subtype of a GeometryCollection, such as MultiPoint or MultiLineString, this method returns the geography instance if called with N=1.

Syntax

  
.STGeometryN ( expression )

Note

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

Arguments

expression
Is an int expression between 1 and the number of geography instances in the GeometryCollection.

Return Types

SQL Server return type: geography

CLR return type: SqlGeography

Remarks

This method returns null if the parameter is larger than the result of STNumGeometries() and will throw an ArgumentOutOfRangeException if the expression parameter is less than 1.

Examples

The following example creates a MultiPoint``geography instance and uses STGeometryN() to find the second geography instance of the GeometryCollection.

DECLARE @g geography;  
SET @g = geography::STGeomFromText('MULTIPOINT(-122.360 47.656, -122.343 47.656)', 4326);  
SELECT @g.STGeometryN(2).ToString();