STOverlaps (geometry Data Type)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Returns 1 if a geometry instance overlaps another geometry instance. Returns 0 if it does not.
Syntax
.STOverlaps ( other_geometry )
Arguments
other_geometry
Is another geometry instance to compare against the instance on which STOverlaps() is invoked.
Return Types
SQL Server return type: bit
CLR return type: SqlBoolean
Remarks
Two geometry instances overlap if the region representing their intersection has the same dimension as the instances do and the region does not equal either instance.
STOverlaps() always returns 0 if the points where the geometry instances intersect are not the same dimension.
This method always returns null if the spatial reference IDs (SRIDs) of the geometry instances do not match.
Examples
The following example uses STOverlaps() to test two geometry instances for overlap.
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('POLYGON((1 1, 3 1, 3 3, 1 3, 1 1))', 0);
SELECT @g.STOverlaps(@h);