$ret[]=update_sql("UPDATE {poll_votes}v SET chid = (SELECT chid FROM {poll_choices} c WHERE v.chorder = c.chorder AND v.nid = c.nid)");
$ret[]=update_sql("UPDATE {poll_votes} SET chid = (SELECT chid FROM {poll_choices} c WHERE {poll_votes}.chorder = c.chorder AND {poll_votes}.nid = c.nid)");