PLSQL warning

Question

Hi All,
I have compiled a procedure which contains the below query, is giving the below warning...Can any one help me to get out of this issue...
Warning(6,3): PLW-07204: conversion away from column type may result in sub-optimal query plan
SELECT count(JOBAMTID) into l_cnt
FROM JOBAMT, JOBDETL
where JOBDETL.PLANTDATE= TO_NUMBER(TO_CHAR(JOBAMT.POSTINGDATE,'YYMMDD'));
Plantdate -- NUMBER(10,0)
Postingdate -- DATE
Even I converted to this number type...getting same error
Edited by: Raj Muthyala on Aug 2, 2012 3:20 PM

Answer 1

Something to play with (considering your plantdate is a number) ;)
with
dates(plantdate) as
(select 120802 from dual union all
select 121314 from dual union all
select 121100 from dual union all
select 121101.75 from dual union all
select 120229 from dual union all
select 20130229 from dual union all
select 201300.5 from dual union all
select 20120802 from dual
select plantdate,
       trunc(mod(trunc(plantdate),1000000)/10000) yy,
       mod(trunc(mod(trunc(plantdate),1000000)/100),100) mm,
       mod(mod(trunc(plantdate),1000000),100) dd,
       case when mod(trunc(mod(trunc(plantdate),1000000)/100),100)
                 between 1
                     and 12
            then case when mod(mod(trunc(plantdate),1000000),100)
                 between 1
                     and to_number(to_char(last_day(to_date(to_char(trunc(mod(trunc(plantdate),
                                                                              1000000
                                                                             ) / 10000
                                                                   ) ||
                                                            lpad(to_char(mod(trunc(mod(trunc(plantdate),
                                                                                       1000000
                                                                                      ) / 100
                                                                             100
                                                                 2,
                                                                 '0'
                                                            'yymm'
                                           'dd'
                      then to_date(to_char(trunc(mod(trunc(plantdate),
                                                     1000000
                                                    ) / 10000
                                          ) ||
                                   lpad(to_char(mod(trunc(mod(trunc(plantdate),
                                                              1000000
                                                             ) / 100
                                                    100
                                        2,
                                        '0'
                                       ) ||
                                   lpad(to_char(mod(mod(trunc(plantdate),
                                                        1000000
                                                    100
                                        2,
                                        '0'
                                   'yymmdd'
                 end
       end the_date
  from datesRegards
Etbin