STTouches (geometry Data Type)

Applies to: SQL Server (all supported versions) Azure SQL Database Azure SQL Managed Instance

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

Syntax

  
.STTouches ( other_geometry )  

Note

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

Arguments

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

Remarks

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.

Examples

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