CREATE FUNCTION getUnqiue(s VARCHAR(255)) RETURNS VARCHAR(1000)
BEGIN
DECLARE final VARCHAR(255);
DECLARE working VARCHAR(255);
DECLARE letter VARCHAR(1);

SET final = '';
SET working = s;

REPEAT
SET letter = MID(working, 0, 1);
IF NOT LOCATE(letter, final) THEN
	SET final = CONCAT(final, letter);
	SET working = RIGHT(CHAR_LEN(working) - 1);
END IF;
UNTIL working = '' END REPEAT;

RETURN final;
END;