Moving data into internal table without header line

Question

Hello experts.
i have two internal tables . itab1 without headerline and itab2 with headerline. itab1 has 10 fields and itab2 has 2 fields.
BEGIN OF itab,
        lifnr LIKE lfa1-lifnr,
        ktokk LIKE lfa1-ktokk,
        name1 LIKE lfa1-name1,
        sortl LIKE lfa1-sortl,
        pstlz LIKE lfa1-pstlz,
        ort01 LIKE lfa1-ort01,
        land1 LIKE lfa1-land1,
       j_1ipanno LIKE j_1imovend,
end of itab.
DATA: itab1 TYPE STANDARD TABLE OF itab.
data: begin of itab2 occurs 0,                             
      lifnr like j_1imovend-lifnr,
      j_1ipanno like j_1imovend-j_1ipanno,
  end of itab2.
now i want to move the data from itab2-j_1ipanno into itab1-j_1ipanno. so pls tell me how to do that. lifnr in both the tables are the same.
thanks for all the replies.

Answer 1

Hi Shiva,
In with out header line,
You declare header line & body separately like
data: IT_MARA type standard table of MARA,
WA_MARA like line of IT_MARA.
Advantages:
1. Clear differentiation of header line over body
2. It is must in the ABAP Objects to have separate header line & body
3. Use ful in Nested Internal tables
Disadvantages:
1. Long syntax
for example: Loop at IT_MARA into WA_MARA.
In with header line
Data ITAB like MARA occurs 0 with header line.
Advantages:
1. Simple to use & declare over without header line.
Also,
With Header line:
codedata : itab like <dbtable> occurs 0 with header line.
Data: begin of itab occurs 0,
f1 type f1,
f2 type f2,
end of itab.[/code]
Without Header line.
codeTypes: begin of ty_tab,
f1 type f1,
f2 type f2,
end of ty_tab.
Data: itab type table of ty_tab, " Internal Table
wa type ty_tab. " Work Area[/code]
at any point of time use internal table without header line,it will be good performance as well OO ABAP will allow only internal table without header line.
Just use one simple example :
create one simple program with header line,use get run time field.
create one simple program without header line,use get run time field.
see the results ,here time will be micro seconds,so take 1000 records to internal table and do calculate the time.
While adding or retrieving records to / from internal table we have to keep the record temporarily.
The area where this record is kept is called as work area for the internal table. The area must have the same structure as that of internal table. An internal table consists of a body and an optional header line.
Header line is a implicit work area for the internal table. It depends on how the internal table is declared that the itab will have the header line or not.
e.g.
data: begin of itab occurs 10,
ab type c,
cd type i,
end of itab. " this table will have the header line.
data: wa_itab like itab. " explicit work area for itab
data: itab1 like itab occurs 10. " table is without header line.
The header line is a field string with the same structure as a row of the body, but it can only hold a single row.
It is a buffer used to hold each record before it is added or each record as it is retrieved from the internal table. It is the default work area for the internal table.
kindly reward if found helpful.
cheers,
Hema.