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CREATE FUNCTION uniqueFlag(flags TEXT) RETURNS TEXTBEGIN	DECLARE output TEXT;	DECLARE i INT DEFAULT 0;	DECLARE len INT DEFAULT 0;	DECLARE temp VARCHAR(1);	SET len = LENGTH(flags);	compareLoop:LOOP		SET temp = SUBSTRING(flags FROM i FOR 1);		SET output = IF(output NOT LIKE CONCAT('%', temp, '%'), CONCAT(output, temp), output);		SET i = i + 1;		IF i < len THEN ITERATE compareLoop; END IF;		LEAVE compareLoop;	END LOOP;	RETURN output;END