Question 779 Let R=(A,B,C,D,E,F) be a relation scheme with the following dependencies: C→ F, E→ A, EC→ D, A→ B Which of the following is a […]

Question 780 the relational algebra expression equivalent to the tuple calculus expression {t|t ​ ∈ ​ r ⋀ (t[A]=10 ⋀ t[B]=20)} is A σ​ (A=10 v […]

Question 781 In a relational schema, each tuple is divided into fields called A relations B Domains C Queries D none of these Database-Management-SystemRelational SchemaNielit Scientist-B […]

Question 782 Global locks A synchronize access to local resources B synchronize access to global resources C are used to avoid local locks D prevent access […]