loop in my sql code example

Example 1: mysql loop

-- MySQL LOOP, ITERATE, LEAVE, loop label
CREATE PROCEDURE LoopDemo()
BEGIN
	DECLARE x  INT;
	DECLARE str  VARCHAR(255);
	SET x = 1;
	SET str =  '';
	loop_label:  LOOP
		IF  x > 10 THEN 
			LEAVE  loop_label;
		END  IF;
		SET  x = x + 1;
		IF  (x mod 2) THEN
			ITERATE  loop_label;
		ELSE
			SET  str = CONCAT(str,x,',');
		END  IF;
	END LOOP;
	SELECT str;
END$$

Example 2: what does iterate do in mysql

-- MySQL

-- Iterate statement is used to skip the current loop iteration and
-- start a new iteration
[label]: LOOP
    ...
    -- terminate the loop
    IF condition THEN
        ITERATE [label];
    END IF;
    ...
END LOOP;