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STDistance (geometry Data Type)
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STDistance (geometry Data Type)

Returns the shortest distance between a point in a geometry instance and a point in another geometry instance.

.STDistance ( other_geometry )

other_geometry

Is another geometry instance from which to measure the distance between the instance on which STDistance() is invoked. If other_geometry is an empty set, STDistance() returns null.

SQL Server return type: float

CLR return type: SqlDouble

STDistance() always returns null if the spatial reference IDs (SRIDs) of the geometry instances do not match.

DECLARE @g geometry;
DECLARE @h geometry;
SET @g = geometry::STGeomFromText('POLYGON((0 0, 2 0, 2 2, 0 2, 0 0))', 0);
SET @h = geometry::STGeomFromText('POINT(10 10)', 0);
SELECT @g.STDistance(@h);

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