How to determine most recent date from the date column of internal table

Question

Dear friends
would you like to tell me. how i determine the most recently changed record by looking at date and time from internal table i am not supposed to sort the table by date and time... I must check date and time with other records date and time to determine which record is most recently changed...
here the scenario is.
id idnumber chdate chtime
1 123456 20060606 135312
2 123456 20060606 135900
3 123456 20060606 132300
4 123457 20060606 140000
5 123457 20060606 142500
in the above scenario i must keep in my mind that the most recently changed record is identical to its idnumber i can say that:
the record should be fetched this way
id idnumber chdate chtime
3 123456 20060606 132300
5 123457 20060606 142500
because here the id 3 is the most recently changed in the idnumber 123456
where id 5 is the most recently changed in the idnumber 123457
please help me to determin how i am supposed to carry out this task any suggestion, code will be great help of mine.
regards
Naim

Answer 1

After testing my suggestion above, I realized that it doesn't work because the delete adjacent actually will keep the first one and delete the rest.  I'm working with Srinivas's code a bit now,  I think it is almost what you want.  I am under the impression that you dont' want to HIGHest date/time, but just the last record of the sequence, if this is the case, then this code will help.  Here we will assign an index to each record per the idnumber, that way we can sort it and get the lastest record.
report zrich_0001.
types: begin of itab_type,
        id       type i,
        idnumber type i,
        chdate   like sy-datum,
        chtime   like sy-uzeit.
types: end of itab_type.
types: begin of itab_type2,
        id       type i,
        idnumber type i,
        index    type i,
        chdate   like sy-datum,
        chtime   like sy-uzeit.
types: end of itab_type2.
data: itab     type table of itab_type with header line,
      itab2    type table of itab_type2 with header line,
      prev_rec type itab_type.
data: v_id type i.
start-of-selection.
  itab-id       = 1.
  itab-idnumber = 123456.
  itab-chdate   = '20060606'.
  itab-chtime   = '135312'.
  append itab. clear itab.
  itab-id       = 2.
  itab-idnumber = 123456.
  itab-chdate   = '20060606'.
  itab-chtime   = '135900'.
  append itab. clear itab.
  itab-id       = 3.
  itab-idnumber = 123456.
  itab-chdate   = '20060606'.
  itab-chtime   = '142500'.
  append itab. clear itab.
  itab-id       = 4.
  itab-idnumber = 123457.
  itab-chdate   = '20060606'.
  itab-chtime   = '140000'.
  append itab. clear itab.
  itab-id       = 5.
  itab-idnumber = 123457.
  itab-chdate   = '20060606'.
  itab-chtime   = '120000'.
  append itab.
  clear itab.
<b>  data: counter type i.
* Assign an index to each row per idnumber
  loop at itab.
    on change of itab-idnumber.
    if sy-tabix > 1.
      clear counter.
      endif.
    endon.
    clear itab2.
    move-corresponding itab to itab2.
    counter = counter + 1.
    itab2-index = counter.
    append itab2.
  endloop.
* Sort it and get rid of older records.
  sort itab2  by idnumber ascending
                 index descending.
  delete adjacent duplicates from itab2 comparing idnumber.</b>
  read table itab2 with key idnumber = '123456'.
  write:/ itab2-chdate, itab2-chtime.
  read table itab2 with key idnumber = '123457'.
  write:/ itab2-chdate, itab2-chtime.
Regards,
Rich Heilman