Reversed loop : For LOOP « PL SQL Statements « Oracle PL/SQL Tutorial

SQL>
SQL>
SQL> set serveroutput on
SQL>
SQL> DECLARE
  2
  3    start_period_number pls_integer := 1;
  4    end_period_number pls_integer := 10;
  5    current_period pls_integer := 5;
  6
  7  BEGIN
  8
  9    dbms_output.put_line('reverse loop...');
 10    FOR loop_counter IN REVERSE 1 .. 10
 11    LOOP
 12      dbms_output.put_line(loop_counter);
 13      -- ... executable statements ...
 14    END LOOP;
 15
 16
 17  END;
 18  /
reverse loop...
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PL/SQL procedure successfully completed.

SQL>
SQL>

22.4.For LOOP
	22.4.1.	FOR Loops
	22.4.2.	FOR LOOP with loop counter
	22.4.3.	Nested FOR LOOP with Labels
	22.4.4.	Nested FOR loop counter
	22.4.5.	Nested three level LOOP
	22.4.6.	Reversed FOR LOOP
	22.4.7.	The upper or lower bounds of the FOR loop can be defined as variables or functions.
	22.4.8.	Nested IF statement in For loop
	22.4.9.	Use FOR LOOP to loop through dates
	22.4.10.	EXIT a FOR LOOP with exit command
	22.4.11.	FOR Loop Scoping Rules
	22.4.12.	FOR Loop Ranges
	22.4.13.	LOOP with Labels
	22.4.14.	A complete example if uisng the cursor variable using a cursor FOR LOOP
	22.4.15.	FOR year_number IN 1800..1995: define variable for a range type
	22.4.16.	Drop any objects to make script re-runnable: for in
	22.4.17.	For loop variable in a range of numbers
	22.4.18.	Reversed loop
	22.4.19.	variable-delimitted loop
	22.4.20.	EXPLAIN PLAN FOR select statement