Table maintenance in a loop?

Question

I have a situation that I'm having trouble resolving.
I'm looping through this list, each time getting a table of keys and offsets. But each time I loop through it, I only want to retain the records that are common and get rid of new or unique records.
I'm thinking the code should be something like:
Loop at itab1.
  call function ...
     exporting
        e_result = reference []
  if count = 0.
     master_list = reference.
     count = count + 1.
  ELSE.
     DELETE FROM MASTER_LIST WHERE RECORDS DON'T MATCH UP IN reference. ???
  ENDIF.
ENDLOOP.
Please help out,
Natasha

Answer 1

Not the prettiest way of doing it, but here is a sample program.
report zrich_0002 .
data: begin of itab occurs 0,
      field1 type c,
      field2 type c,
      field3 type c,
      end of itab.
start-of-selection.
  itab-field1 = 'A'.
  itab-field2 = 'B'.
  itab-field3 = 'C'.
  append itab.
  append itab.
  itab-field1 = 'C'.
  itab-field2 = 'D'.
  itab-field3 = 'E'.
  append itab.
  itab-field1 = 'F'.
  itab-field2 = 'G'.
  itab-field3 = 'H'.
  append itab.
  append itab.
  data: counter type i.
  loop at itab.
    clear counter.
    loop at itab where field1 = itab-field1.
      counter =  counter + 1.
    endloop.
    if counter =  1.
      delete itab.
      continue.
    endif.
  endloop.
  check sy-subrc  = 0.
Regards,
Rich Heilman