 	login_id CHAR (10)
 	name VARCHAR(30)
 	password VARCHAR(16)
-	major_credit_card_num CHAR(16)
+	major_credit_card_num INTEGER
 	address VARCHAR (50)
-	phone_num CHAR(10)
+	phone_num INTEGER
 	PRIMARY KEY (login_id))
 
 CREATE TABLE Books(

	ISBN CHAR(14)
	score INTEGER CHECK (score <= 10 AND score >= 0)
	date DATE 
	short_text VARCHAR(100)
	PRIMARY KEY (login_id, ISBN)
	FOREIGN KEY (login_id) REFERENCES Customer
	FOREIGN KEY ISBN) REFERENCES Books)

	ISBN CHAR (14)
	PRIMARY KEY(ISBN, rater_id, ratee_id)
	FOREIGN KEY rater_id REFERENCES Customer
	FOREIGN KEY ratee_id REFERENCES feedback
	FOREIGN KEY (ISBN) REFERENCES Books)

