(A) flight number
(B) flight number + place of departure
(C) flight number + date
(D) flight number + destination
Which of the following desired features are beyond the capabilty of rational algebra?
(A) Aggregate computation
(B) Multiplication
(C) Finding transtive clousure
(D) All of the above
Which year is declared as the warmest year in history by United Kingdom?
(A) 2018
(B) 2021
(C) 2022
(D) 2019
The data flow model of an application mainly shows?
(A) the underlying data and the relations among them
(B) processing requirments and the floe of data
(C) decesion and control information
(D) communication and network structure
What are the potental problems when a DBMS executes multiple transections concurrently?
(A) The lost update problem
(B) The dirty read problem
(C) The unrepeatable read problem
(D) All the three
The column of a table is reffered to as the?
(A) tuple
(B) attribute
(C) entity
(D) degree
If every non key attrebute is functionaly dependent on the primary key then the relation will be in?
(A) first normal form
(B) second normal form
(C) third normal form
(D) fourth normal form
Given Relations R(w,x) and S(x,y) the result of SELECT DISTINCT w,x FORM R,S is guaranted to be same as R,if?
(A) R has no duplicates and S is non-empty
(B) R and S has no duplicates
(C) S has no duplicates and R is non-empty
(D) R and S has same numbers of tuples