 select bhv.id,count(1) as Bound
            from bst_hardware_version bhv
        left join bst_device bd
        on bhv.id = bd.hardware_version_id
        where bd.mch_id is not null
        group by bhv.id
        
        
       select bhv.id,count(1) as unBound
        from bst_hardware_version bhv
                 left join bst_device bd
                           on  bd.hardware_version_id = bhv.id
        where bd.mch_id is null
        group by bhv.id