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Oracle WHILE Loop

The WHILE loop is executed untill the condition of end is fulfilled. Simple example:

v_counter NUMBER(2); --declaration of counter variable
 v_counter := 0; --point of start, first value of our iteration
 WHILE v_counter < 10 LOOP --exit condition

 DBMS_OUTPUT.put_line('Current iteration of loop is ' || v_counter); --show current iteration
number in dbms script output
 v_counter := v_counter + 1; --incrementation of counter value, very important step
 END LOOP; --end of loop declaration

This loop will be executed untill current value of variable v_counter will be less than ten.

The result:

CURRENT iteration OF LOOP IS 0
CURRENT iteration OF LOOP IS 1
CURRENT iteration OF LOOP IS 2
CURRENT iteration OF LOOP IS 3
CURRENT iteration OF LOOP IS 4
CURRENT iteration OF LOOP IS 5
CURRENT iteration OF LOOP IS 6
CURRENT iteration OF LOOP IS 7
CURRENT iteration OF LOOP IS 8
CURRENT iteration OF LOOP IS 9

The most important thing is, that our loop starts with '0' value, so first line of results is 'Current iteration of loop is 0'.


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