ABAP Programs: Dynamic sort command with several sort criteria

REPORT ZSOURCE2302.
* Parameters for the sort criterion, can be modified by the end user
PARAMETERS: COLUMN1(10) DEFAULT ‘NAME’,
COLUMN2 LIKE COLUMN1 DEFAULT ‘ID’.
* Declarations for later use
TABLES CUSTOMERS.
FIELD-SYMBOLS : TYPE ANY.

DATA ALL_CUSTOMERS LIKE CUSTOMERS OCCURS 100
WITH HEADER LINE.
* Filling the internal table
SELECT * FROM CUSTOMERS INTO TABLE ALL_CUSTOMERS.
* Dynamic sort with two sort criteria
SORT ALL_CUSTOMERS BY (COLUMN1) (COLUMN2) DESCENDING.
* Displaying the result
LOOP AT ALL_CUSTOMERS.
WRITE: / ALL_CUSTOMERS-ID,
ALL_CUSTOMERS-NAME,
ALL_CUSTOMERS-CITY,
ALL_CUSTOMERS-TELEPHONE.
ENDLOOP.