Answer Posted / sandipan banerjea

first we should know what a structure is.it is a SINGLE row.

let us consider few examples:

1) DATA struc_xyz TYPE sflight.

here, we are declaring a structure variable by the name
"struc_xyz" which can hold the values for the same fields
which are present in "sflight".
if the fields present in "sflight" are say
"carrid","connid","fldate", then the structure variable
"struc_xyz" can hold the values for the above mentioned fields.

but suppose from "sflight" we want only "carrid", and
"connid", why should we use the whole of "sflight"?its a
performance issue.

2) TYPES:BEGIN OF abc,

carrid TYPE sflight-carrid,
connid TYPE sflight-connid,

END OF abc.

DATA struc_xyz TYPE abc.

here, "struc_xyz" is the structure variable and "abc" is a
local structure type which we have created using the keyword
TYPES.

now,let us move on to TABLE TYPE.

what does the word "TABLE" in "TABLE TYPE" suggest?!

the run time table variable which is nothing but the
internal table, is to be dealt with now.

3) TYPES gty_flights TYPE STANDARD TABLE OF sflight.
DATA itab_gty_flights TYPE gty_flights.

here, "gty_flights" is the local table type.THE TYPE OF AN
INTERNAL TABLE IS CALLED AS "TABLE TYPE".
"itab_gty_flights" is the internal table.

a common begineer's error is :

DATA itab_gty_flights TYPE STANDARD TABLE OF gty_flights.

in such a case, "itab_gty_flights" will be declared as an
internal table whose rows are themselves internal tables!!!


NOTE: i have used the keyword TYPES in examples 2 and 3.

they have declared a local structure type and a local table
type respectively.

you can declare both the types globally.refer the next two
examples below and compare with examples 2 and 3.i hope, you
will notice the differences!!

4)

DATA: BEGIN OF struc_xyz,

carrid TYPE sflight-carrid,
connid TYPE sflight-connid,

END OF struc_xyz.

5)

DATA itab_gty_flights TYPE STANDARD TABLE OF sflight.



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