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DELIMITER $//$

CREATE FUNCTION DRIVER$\_$STATUS$($driver$\_$id INT$)$ RETURNS VARCHAR$(10)$

DETERMINISTIC

BEGIN

DECLARE TRAVEL$\_$COUNT INT DEFAULT $0$;

DECLARE DRIVER$\_$LEVEL VARCHAR$(10)$;

SELECT COUNT$(*)$ INTO TRAVEL$\_$COUNT

FROM TRAVELS

WHERE DRIVER$\_$ID $=$ driver$\_$id;

IF TRAVEL$\_$COUNT $>4$ THEN

SET DRIVER$\_$LEVEL $=$ 'MASTER';

ELSEIF TRAVEL$\_$COUNT $>2$ THEN

SET DRIVER$\_$LEVEL $=$ 'PRO';

ELSE

SET DRIVER$\_$LEVEL $=$ 'ROOKIE';

END IF;

RETURN DRIVER$\_$LEVEL;

END $//$

DELIMITER;