DELIMITER $$
CREATE OR REPLACE DEFINER=`root`@`localhost` FUNCTION `vn`.`client_hasDifferentCountries`(vClientFk INT)
	RETURNS tinyint(1)
	NOT DETERMINISTIC
	READS SQL DATA
BEGIN
/**
 * Return if client have address in different countries.
 *
 * @param vClientFk The id client
 * @return BOOL
 **/
	RETURN (SELECT COUNT(DISTINCT c.id) > 1 
		FROM `address` a
			JOIN province p ON p.id = a.provinceFk 
			JOIN country c ON c.id = p.countryFk 
		WHERE a.clientFk = vClientFk
			AND a.isActive);
	
END$$
DELIMITER ;