DELIMITER $$
CREATE OR REPLACE DEFINER=`root`@`localhost` PROCEDURE `vn2008`.`niching`(IN i_ini INT, IN i_end INT
, IN i_bal INT, IN i_col INT )
BEGIN

DECLARE i INT(5);
DECLARE j INT(5);

DROP TEMPORARY TABLE IF EXISTS labels;

CREATE TEMPORARY TABLE `labels`
  (`label` VARCHAR(15) NULL)
ENGINE=MEMORY DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

WHILE i_ini <= i_end DO

    SET i = i_bal;

    WHILE i > 0 DO



      SET j = i_col;
      IF j = 0 THEN
          INSERT INTO labels(label)
          VALUES (CONCAT(i_ini,IF(i=0,' ',char(64 + i))));
      ELSE

        WHILE j > 0 DO

          INSERT INTO labels(label)
          VALUES (CONCAT(i_ini,char(64 + i), j));

          SET j = j - 1;

       END WHILE;
    END IF;
    SET i = i - 1;

    END WHILE;

SET i_ini = i_ini + 1;

END WHILE;

SELECT CONCAT('*',label,'*') as label, label as id FROM labels;

END$$
DELIMITER ;