STTouches (geometry Data Type)

THIS TOPIC APPLIES TO:yesSQL Server (starting with 2008)yesAzure SQL DatabasenoAzure SQL Data Warehouse noParallel Data Warehouse

Returns 1 if a geometry instance spatially touches another geometry instance. Returns 0 if it does not.

|Applies to: SQL Server ( SQL Server 2008 through current version), Azure SQL Database.|


.STTouches ( other_geometry )  


Is another geometry instance to compare against the instance on which STTouches() is invoked.

Return Types

SQL Server return type: bit

CLR return type: SqlBoolean


Two geometry instances touch if their point sets intersect, but their interiors do not intersect.

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


The following example uses STTouches() to test two geometry instances to see if they touch.

DECLARE @g geometry;  
DECLARE @h geometry;  
SET @g = geometry::STGeomFromText('LINESTRING(0 2, 2 0, 4 2)', 0);  
SET @h = geometry::STGeomFromText('POINT(1 1)', 0);  
SELECT @g.STTouches(@h);  

See Also

Spatial Indexes Overview
OGC Methods on Geometry Instances