DropOverviewConstraints — Untag a raster column from being an overview of another.
boolean DropOverviewConstraints(name 
        ovschema, name 
        ovtable, name 
        ovcolumn);
boolean DropOverviewConstraints(name 
        ovtable, name 
        ovcolumn);
Remove from a raster column the constraints used to show it as
being an overview of another in the raster_overviews
raster catalog.
        
When the ovschema parameter is omitted,
the first table found scanning the search_path
will be used.
        
Availability: 2.0.0