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UnionAggregate (geography Data Type)

Performs a union operation on a set of geography objects.

Applies to: SQL Server (SQL Server 2012 through current version), Azure SQL Database.

UnionAggregate ( geography_operand )

geography_operand

Is a geography type table column that holds the set of geography objects on which to perform a union operation.

SQL Server return type: geography

Method returns null if the input has different SRIDs. See Spatial Reference Identifiers (SRIDs).

Method ignores null inputs.

Note Note

Method returns null if all inputted values are null.

The following example performs a UnionAggregate on a set of geography location points within a city.

USE AdventureWorks2012

GO

SELECT City,

geography::UnionAggregate(SpatialLocation) AS SpatialLocation

FROM Person.Address

WHERE PostalCode LIKE('981%')

GROUP BY City;

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