49. Relation algebra 中的 DIVISION 可以用哪些 operations 取代？
(A)SELECT, PROJECT, MINUS
(B) PROJECT, MINUS, CROSS PRODUCT
(C) PROJECT, INTERSECTION, CROSS PRODUCT
(D) SELECT, INTERSECTION, CROSS PRODUCT

答案：登入後查看
統計： A(4), B(13), C(11), D(10), E(0) #2553254