Question: Given that X, Y, Z are attributes in a relation, using the Armstrongs axioms, prove that if we have X Y and X Z, then

Given that X, Y, Z are attributes in a relation, using the Armstrongs axioms, prove that if we have X Y and X Z, then X Y Z.

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!

Q:

Given that X, Y, W, Z are attributes in a relation, using the Armstrongs axioms, prove that if we have X Y and Y W Z, then XW Z.

Q:

Use truth tables to verify which one of the following compound statements is a tautology/contradiction/contingency. (5) a) [( ) ] b) ( ) ( ) 2. Use truth tables to show that ( ) ( ) ( ) are logically...

Q:

Use truth tables to verify which one of the following compound statements is a tautology/contradiction/contingency. (5) a) [( ) ] b) ( ) ( ) 2. Use truth tables to show that ( ) ( ) ( ) are logically...

Q:

Consider the Armstrongs Axioms, where X, Y, Z and W are sets of attributes: Question 7 (10 marks) Consider the Armstrong's Axioms, where X, Y, Z and W are sets of attributes: Reflexivity: If XY, then...

Q:

Homework # 8 1 . Consider the following relation r below. r A B C D E a 1 b 1 c 1 d 1 e 1 a 1 b 2 c 2 d 2 d 1 a 2 b 1 c 3 d 3 e 1 a 2 b 1 c 4 d 3 e 1 a 3 b 2 c 5 d 1 e 1 Which of the following FDs...

Q:

1. Consider the following relation r below. Which of the following FDs does r satisfy? 2. Let F = {AB C, B D,CD E,CE GH,G A). Using Armstrong's axioms, give proofs for the following: 3. Prove or...

Q:

Relational Detabases: Functional Dependency Problem: 1. Consider the following relation r below. Which of the following FDs does r satisfy? 2. Let F-(AB C, B D.CD E.CE GII,G A). Using Armstrong's...

Q:

A discrete sequence {xn} can be converted into a continuous representation x(t) = ts X n= (t n ts) xn, where ts is the sampling period. (a) State two characteristic properties of Dirac's function. [2...

Q:

Consider the following 3 problems in Database Management below: 1. Consider the following relation r below. Which of the following FDs does r satisfy? 2. Let F-(AB C, B D.CD E.CE GII,G A). Using...

Q:

QUIZ... Let D be a poset and let f : D D be a monotone function. (i) Give the definition of the least pre-fixed point, fix (f), of f. Show that fix (f) is a fixed point of f. [5 marks] (ii) Show that...

Q:

John Lucy makes wooden boxes in which to ship motorcycles. John and his three employees invest a total of 40 hours per day making the 120 boxes. (a) What is their productivity? (b) John and his...

Q:

In Exercise 45 we poured a large and a small bowl of cereal from a box. Suppose the amount of cereal that the manufacturer puts in the boxes is a random variable with mean 16.2 ounces and standard...

Q:

Question 7 . 3 ( Total: 2 8 marks ) Feather Ltd . invested $ 1 million in Goose Corp. early in the current year, receiving 2 5 % of its outstanding shares. At the time of the purchase, Goose Corp....

Q:

CT Corp Comprehensive Question Canadian Tire Corporation, Limited (Canadian Tire) is a family of companies that includes a retail segment and a financial services division, among others. The retail...

Q:

Read the article summarised in focus on research 11.7 and suggest other HRM actions that the organisation could have taken after the strike to meet the employees aims.

Q:

Role- play the situation of an interview with an employee coming back to work in an engineering environment after an extended period of absence through having a bad back.

Q:

What types of specific skills (such as knowledge of financial accounting methods) do you think HR professionals will need to have the business, professional-technical, change management, and...