Question 523 The dependency preservation decomposition is a property to decompose database schema D, in which each functional dependency X → Y specified in F, A […]

Question 526 Given relations R(w,x) and S(y,z), the result of SELECT DISTINCT w, x FROM R.S is guaranteed to be same as R, if A R […]

Question 527 The task of correcting and preprocessing data is called as A Data streaming B Data cleaning C Data mining D Data storming Database-Management-Systemdata-miningUGC NET […]