Doubt in loop.......endloop and Read..........

Question

Hi,
      the current syntax  we are using for looping a internal table is
1. loop at itab
  assigning <fs_itab>.
if <fs_itab> is assigned.
endif.
endloop. 
My TL suggested me that if the field symbol is not  assigned then it will not move into the loop. So there is no need for checking if the field symbol is assiged or not. I am not sure please suggest.
2. One more question current read syntax we are using
    read itab assigning <fs_itab>............
         if <fs_itab> is assigned.
         endif.
instead of checking if the field symbol is assigned can check the sy-subrc.
will there be any case in which even if the field symbol is not assigned there is chance of sy-subrc eq 0. Please suggest

Answer 1

Hi,
For ur first question field symbol check is not required as the field symbol will get assigned only if the itab contains the data.
But for ur second question, it is better to check with SY-SUBRC as the field symbol always contains the data of the internal table for every iteration. It could be a problem if  u r reading the data with some where clause as the the field symbol will not get refreshed and contains the previous record data irrelevent to the success of the READ statement.
U need to perform some operation only if the read statement is successfull. If u r using READ statment then it is always better to use SY-SUBRC instead of checking with destination one.
Reward points if this is helpful for u.
Chandrasekhar K