ST_Distance function [Spatial]

ST_Distance( geo1,geo2 )

Name	Type	Description
geo1	ST_Geometry	The first geometry value to be used to calculate the distance between two geometry values.
geo2	ST_Geometry	The second geometry value to be used to calculate the distance between two geometry values.

The following statement returns the result 3367142.4632130372:

SELECT ST_Distance(ST_Point(-79.38,43.65,4326),ST_Point(-123.1,49.28,4326))