DBI202Xuất hiện trong 1 đề thi
Consider the relation: $OrderDetail(orderNumber, productCode, productName, quantity, dateOrdered, salesDiscount)$ And FDs { $\{orderNumber, productCode\} o quantity$, $orderNumber o dateOrdered$, $productCode o productName, salesDiscount$ } And the key of OrderDetail is $\{orderNumber, productCode\}$. Which of the following is full dependency on the key?
Các lựa chọn
A$\{orderNumber, productCode\} o quantity$
B$orderNumber o dateOrdered$
C$productCode o productName$
D$productCode o productName, salesDiscount$