Answer Posted / sudhir kumar

Basically there are 3 methods of creating the internal table which are used frequently, are as following:

1) for ex.

data: it_mara type table of mara.

note: after type table of, always a structure is used.
hence, here we call it structure mara not table mara.
and one thing more, here we can use like table of . but
it is not recommend. it is mostly used method.

2) for ex.

data: it_mara type mara occurs 0.

it means it_mara is a internal table of type mara.if we
write:

data: it_mara type mara occurs o with headerline.

it means there will be a internal table and a workarea
with the same name i.e. it_mara. hence it will little
confusing.

3) tables mara.
data: it_mara like mara occurs 0.

here, with the help of first statement, a workarea will be created with the name of mara and second statement will crate internal table with the name of it_mara. This is also little confusing because we mara is also of database table name and here it is also name of work area.

for exe.

select *
from mara
into mara.

hence, first method is most suitable and it should be used.

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