postgresql7.1 select tree_sortkey, item_id from cr_items where parent_id = etp__get_folder_id(:package_id) and tree_sortkey < :sort_key order by tree_sortkey desc select tree_sortkey, item_id from cr_items where tree_sortkey >= :prev_sort_key order by tree_sortkey update cr_items set tree_sortkey = :new_sortkey where item_id = :item_id