oracle8.1.6 select nvl(sum(eg.weight),0) as total_weight from evaluation_gradesi eg, acs_objects ao where content_revision.is_live(eg.grade_id) = 't' and ao.context_id = :package_id and eg.item_id = ao.object_id select nvl(sum(eg.weight),0) from evaluation_gradesx eg, acs_objects ao where content_revision.is_live(eg.grade_id) = 't' and eg.item_id = ao.object_id and ao.context_id = :package_id