- FROM (SELECT uid,username, date_part('day',now() - laston)::int AS last FROM users) u NATURAL JOIN groupmembers NATURAL JOIN groups WHERE flag = ? AND (last >= ? OR last IS NULL) ORDER BY last DESC
+ FROM (SELECT uid,username, date_part('day',now() - laston)::int AS last,laston FROM users) u NATURAL JOIN groupmembers NATURAL JOIN groups WHERE flag = ? AND (last >= ? OR last IS NULL) ORDER BY laston