DBI202Xuất hiện trong 1 đề thi
Consider the relation: OrderDetail (orderNumber, productCode, productName, quantity, dateOrdered, salesDiscount) And FDs { orderNumber, productCode $\to$ quantity, orderNumber $\to$ dateOrdered, productCode $\to$ productName, salesDiscount } And the key of OrderDetail is {orderNumber, productCode} Which of the following is full dependency on the key?
Các lựa chọn
AorderNumber, productCode $\to$ quantity
BorderNumber $\to$ dateOrdered
CproductCode $\to$ productName
DproductCode $\to$ productName, salesDiscount