PHP에서 빼기를 하는 방법에 대해 질문드립니다.~ 채택완료

$sql_money = "select  wr_7 ,wr_12 , count(*) as total from g5_write_feedback 

    where wr_7 != '판매대기' and wr_18 !='반출' and wr_18 !='환불' and wr_is_comment = 0 and del_yn ='n' and wr_13 != '' and wr_datetime >= '".date("Y-m-01 H:i:s")."' and wr_datetime <= '".date("Y-m-d H:i:s")."'   group by wr_7 order by total desc limit 22";          

            

$sql_money = "select  wr_7 ,wr_12 , count(*) as total from g5_write_feedback </p>

<p>       where wr_7 != '판매대기' and wr_18 !='매입' and wr_18 !='추가' and wr_is_comment = 0 and del_yn ='n' and wr_13 != '' and wr_datetime BETWEEN LAST_DAY(NOW() - interval 2 month) + interval 1 DAY AND LAST_DAY(NOW() - interval 1 MONTH) and wr_9 >= '".date("Y-m-01 H:i:s")."' and wr_9 <= '".date("Y-m-d H:i:s")."' group by wr_7 order by total desc limit 22";