ABAP Programs: Appending multiple lines

REPORT ZSOURCE1205.
* Work area for a database table
TABLES CUSTOMERS.
* Defining internal tables
DATA: ALL_CUSTOMERS LIKE CUSTOMERS OCCURS 100
WITH HEADER LINE,
OLD_CUSTOMERS LIKE CUSTOMERS OCCURS 10
WITH HEADER LINE.

* Filling both internal tables
SELECT * FROM CUSTOMERS INTO TABLE ALL_CUSTOMERS.
SELECT * FROM CUSTOMERS INTO TABLE OLD_CUSTOMERS.
* Appending one internal table to the other
APPEND LINES OF OLD_CUSTOMERS TO ALL_CUSTOMERS.
* Displaying the result
LOOP AT ALL_CUSTOMERS.
WRITE / ALL_CUSTOMERS-NAME.
ENDLOOP.

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