DIFF: Field string ,Structure and Internal table declaration

[Former Member]

Hai,

what is the diference between Field string ,Structure in ABAP program and Internal table declaration and how it will work ?

Thank you

ASHOK KUMAR.

[Former Member]

Hi,

Structure:

Types : Begin of st,

<include fields wth data type>,

End of sr.

Internal table

Data : itab type standard table of st .

Thanks

Sandeep

Reward if helpful

[Former Member]

hi ashok,

internal tables: used for temporary storages.internal tables can be with or with out header lines.

structures: used to different fields together in a single unit. it doesnt occupy any memory. it doesnt hav any primary key. its just a template.

field symbols: using this field symbols we can store any type of data. i.e for internal tables we declare a table with respect to a table.and we cant store data of another table in that table where as a field symbol can be used for generic purpose.

i.e we can store any table data in it. it depends on runtime what kind of data that we r using that field symbol.

if helpful reward some points.

with regards,

suresh babu aluri.

[Former Member]

Hi,

data : begin of itab occurs 0.

include sctruture mara.

end of itab.

now iTAB HAS THE STRUTURE OF MARA

OR

data : begin of itab occurs 0,

MATNR LIKE MARA-MATNR,

--- DECLARE ALL FIELDS INDIVIDUALLY

end of itab.

SO STRUCTURE HELPS TO DO IN A SINGLE STEP

Thanks

venki

[Former Member]

hi,

Look this u will get a good idea.

*&---------------------------------------------------------------------*
*& Report  ZTYPES                                                      *
*&                                                                     *
*&---------------------------------------------------------------------*
REPORT  ZTYPES                                                  .

* Table declaration (old method)
DATA: BEGIN OF tab_ekpo OCCURS 0,             "itab with header line
  ebeln TYPE ekpo-ebeln,
  ebelp TYPE ekpo-ebelp,
 END OF tab_ekpo.

*Table declaration (new method)     "USE THIS WAY!!!
TYPES: BEGIN OF t_ekpo,
  ebeln TYPE ekpo-ebeln,
  ebelp TYPE ekpo-ebelp,
 END OF t_ekpo.
DATA: it_ekpo TYPE STANDARD TABLE OF t_ekpo INITIAL SIZE 0,      "itab
      wa_ekpo TYPE t_ekpo.                    "work area (header line)

* Build internal table and work area from existing internal table
DATA: it_datatab LIKE tab_ekpo OCCURS 0,      "old method
      wa_datatab LIKE LINE OF tab_ekpo.

* Build internal table and work area from existing internal table,
* adding additional fields
TYPES: BEGIN OF t_repdata.
        INCLUDE STRUCTURE tab_ekpo.  "could include EKKO table itself!!
TYPES: bukrs  TYPE ekpo-werks,
       bstyp  TYPE ekpo-bukrs.
TYPES: END OF t_repdata.
DATA: it_repdata TYPE STANDARD TABLE OF t_repdata INITIAL SIZE 0,   "itab
      wa_repdata TYPE t_repdata.                 "work area (header line)

Regards

Reshma