DELIMITER $$
CREATE procedure checkMonthTax(IN studId INT, IN groupId INT, IN paymentMonth INT, IN paymentYear INT)
BEGIN
DECLARE result char(1);
SET result = 0;
    IF( (SELECT paymentAmount
        FROM taxespayment
        WHERE student_id = studId
        AND group_id = groupId
        AND month = paymentMonth
        AND year = paymentYear) IS NOT NULL)
    THEN
        SET result = 1;
    ELSE
        SET result = 0;
    END IF;
SELECT result AS IsTaxPayed;
END$$;
DELIMITER ;
CALL checkMonthTax(1,1,1,2022);