select ((((dockmanagementtable.setvalueh * 60*60) +
(dockmanagementtable.setvaluem * 60)) - dockinfotable.elapsedsecs)/60) as
mycolumn from dockinfotable inner join dockmanagementtable;

select ((((dockmanagementtable.setvalueh * 60*60) +
(dockmanagementtable.setvaluem * 60)) - dockinfotable.elapsedsecs)/60)
mycolumn from dockinfotable inner join dockmanagementtable;