쿼리문 질문드립니다.

$write_table = $g5['write_prefix'] . $bo_table;
                $sum_count = "0";
                $sql = "
                    select group_concat(wr_11 separator '||') wr_11
                      from {$write_table}
                     where wr_11 like '%{$stx3}%'


                ";
                $result = sql_query($sql, true);
                while ($row = sql_fetch_array($result)) {
                    $sum_count ++;