ORA-01843:不是更改条件的有效月份

Question

我遇到以下错误

ORA-01843:不是有效月份

SELECT  mx.work_order_no, mx.work_order_name, mx.comments
  FROM  max_orders mx
 WHERE  TO_DATE (wo_dt, 'dd/mm/rr') <= (TO_DATE (SYSDATE, 'dd/mon/rr') - 7)

WHERE   TO_DATE (wo_dt, 'dd/mm/rr') >= (TO_DATE (SYSDATE, 'dd/mon/rr') - 7)

底层视图

SELECT    work_order_no,
          work_order_name,
                 wo_dt,
                comments
      FROM    (SELECT     mx_master.work_order_no,
                             mx_master.work_order_name,
                             SUBSTR (mx_master.uom, 1, 15) wo_dt,
                             mx_master.remarks
                    FROM     mx_wo_data mx_master)

Answer 1

我建议您创建一个存储函数来识别错误的行：

create function invalid_date(p_d in varchar2) return number as
  v_d date;
begin
  v_d := TO_DATE(p_d, 'dd/mm/rr');
  return 0;
exception 
  when others then
    return 1;
end;
/

select * from mx_orders where invalid_date(wo_dt)=1;