Question 250 The physical location of a record is determined by a mathematical formula that transforms a file key into a record location is: A B-Tree […]

Question 252 Consider a relational schema S=(U,V,W,X,Y,Z) on which the following functional dependence hold: { U → V, VW → X, Y → W, X → […]

Question 256 An expression in the domain relational calculus is of the form: A {P(x1,x2,…,xn) | ⟨x1,x2,…,xn⟩} B {x1,x2,…,xn | ⟨x1,x2,…,xn)} C {x1,x2,…,xn | x1,x2,…,xn} D […]