Logic to find missing entries

Question

Hello all...i'm new to abap programming and i had a small doubt regarding a logic.
The logic is to obtain missing entries from 2 internal tables by comparing them.
for ex tab1 may contain some entries not present in tab2 and vice-versa.
i want to accomplish this by using only two loops i.e. nested loops. is it possible? pls let me know!
Regards,
Rahul
Message was edited by:
        Rahul Khanna

Answer 1

the following code will just provide you with logic,
imagine the two tables to be itab1 and itab2
and itab3 will have the mismatched values,
see carefully the steps used for code optimization,
the loop is processed only once
REPORT  ZTRIP_TEST.
data: itab1 like table of lfa1 with header line,
itab2 like table of lfa1 with header line,
itab3 like table of lfa1 with header line. "Table to hold mismatch values
data: line1 type i,
line2 type i.
describe table itab1 lines line1.
describe table itab2 lines line2.
sort: itab1,itab2.
if line1 ge line2.
  loop at itab1.
    read table itab2 with key lifnr = itab1-lifnr binary search.
    if sy-subrc ne 0.
      append itab1 to itab3.
    else.
      delete itab2 where lifnr eq itab1-lifnr.
    endif.
  endloop.
  append lines of itab2 to itab3.
else.
  loop at itab2.
    read table itab1 with key lifnr = itab2-lifnr binary search.
    if sy-subrc ne 0.
      append itab2 to itab3.
    else.
      delete itab1 where lifnr = itab2-lifnr.
    endif.
  endloop.
  append lines of itab1 to itab3.
endif.
*Now itab3 will contain mismatched enteries
Reward points if useful, get back in case of query...
Cheers!!!
Message was edited by:
        Tripat Pal Singh