STDistance (geometry Data Type)

Straipsnis
05/23/2023

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric

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

Syntax

  
.STDistance ( other_geometry )

Note

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

Arguments

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.

Return Types

SQL Server return type: float

CLR return type: SqlDouble

Remarks

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

Examples

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);