Question: 2. (10 points) Consider the following database schema Flight (Source, Destination) Hub (City) Q.(A,B): +Flight (A,C), Hub(C), Flight(C,B), Hub(B) Qz(A,B): -Flight(A,C), Hub(C), Flight(C,B) (a) (5

2. (10 points) Consider the following database schema Flight (Source, Destination)

Hub (City) Q.(A,B): +Flight (A,C), Hub(C), Flight(C,B), Hub(B) Qz(A,B): -Flight(A,C), Hub(C), Flight(C,B)

2. (10 points) Consider the following database schema Flight (Source, Destination) Hub (City) Q.(A,B): +Flight (A,C), Hub(C), Flight(C,B), Hub(B) Qz(A,B): -Flight(A,C), Hub(C), Flight(C,B) (a) (5 points) Use the conjunctive query containment algorithm to show that Q, Q2 (b) (5 points) Unfold the following query Q3(A,B): -Q1(A,C), Q2(C,B) 2. (10 points) Consider the following database schema Flight (Source, Destination) Hub (City) Q.(A,B): +Flight (A,C), Hub(C), Flight(C,B), Hub(B) Qz(A,B): -Flight(A,C), Hub(C), Flight(C,B) (a) (5 points) Use the conjunctive query containment algorithm to show that Q, Q2 (b) (5 points) Unfold the following query Q3(A,B): -Q1(A,C), Q2(C,B)

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Databases Questions!

C++ Programming language You ARE NOT ALLOWED to use any data structure or algorithm related function from the C++ standard template library (STL). Dataset routes.csv for the homework =...

A creative engineer suggests structuring the TLB so that not all the bits of the presented address need match to result in a hit. Suggest how this might be achieved, and what might be the costs and...

Managing Scope Changes Case Study Scope changes on a project can occur regardless of how well the project is planned or executed. Scope changes can be the result of something that was omitted during...

Portray in words what transforms you would have to make to your execution to some degree (a) to accomplish this and remark on the benefits and detriments of this thought.You are approached to compose...

Briefly describe ASCII and Unicode and draw attention to any relationship between them. [3 marks] (b) Briefly explain what a Reader is in the context of reading characters from data. [3 marks] A...

Suppose that R(A, B, C) is a relational schema with functional dependencies F = {A, B C, C B}. (i) Is this schema in 3NF? Explain. [2 marks] (ii) Is this schema in BCNF? Explain. [2 marks] (b)...

Prolog You are approached to compose a Prolog program to work with twofold trees. Your code shouldn't depend on any library predicates and you ought to expect that the mediator is running without...

Let A, B be sets. Define: (a) the Cartesian product (A B) (b) the set of relations R between A and B (c) the identity relation A on the set A [3 marks] Suppose S, T are relations between A and B, and...

This question involves the use of AGGREGATE linear PYTHOIN regression on the Auto data set. (a) Perform a simple linear regression with mpg as the response and horsepower as the predictor. Describe...

True-False Questions 1. Normalizing accounting data refers primarily to eliminating errors and outliers, thus creating ?normal data.? 2. An important reason for normalizing data is to eliminate data...

Set up the following T-accounts: Cash, Accounts Receivable, Office Supplies, Office Furniture, Accounts Payable, Common Stock , Dividends, Service Revenue, Salary Expense, and Rent Expense. Record...

constantin method

12 The cost of a holiday depends on the number of nights. The cost for n nights is Sc where c=100n+50. a b Construct a table to show the cost for different values of n. Draw a graph to show the cost....

On 1 March 2007 DB Limited issued R560 000 15% debentures at R98. The debentures were to be redeemed at par in four equal annual payments starting 28 February 2010. Required: Journalise the above...