STDisjoint (geometry Data Type)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Returns 1 if a geometry instance is spatially disjoint from another geometry instance. Returns 0 if it is not.
Syntax
.STDisjoint ( other_geometry )
Arguments
other_geometry
Is another geometry instance to compare against the instance on which STDisjoint() is invoked.
Return Types
SQL Server return type: bit
CLR return type: SqlBoolean
Remarks
Two geometry instances are disjoint if the intersection of their point sets is empty.
This method always returns null if the spatial reference IDs (SRIDs) of the geometry instances do not match.
Examples
The following example uses STDisjoint() to test two geometry instances for spatial disjoint.
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.STDisjoint(@h);