Question: Consider the Datalog program P: T (x) e(x), T (x) a(x, y) ^ T (y) ^ b(x, z) ^ T (z) (a) Describe, in your

Consider the Datalog program P:

T (x) e(x), T (x) a(x, y) ^ T (y) ^ b(x, z) ^ T (z)

(a) Describe, in your own words, the kind of structures that the query hT, Pi recognises. (b) Compute the semi-naive evaluation of P for the database D with the following facts: e(1) e(2) e(6) a(3, 1) a(4, 3) a(5, 3) a(7, 5) b(3, 2) b(5, 3) b(7, 6) Specify for each newly derived fact which of the rule(s) will produce it at the given point in the derivation.

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!

Consider the Datalog program P: T (x) e(x), T(x) a(x,y)^T(y)^b(x,z)^T(z). (a) Describe, in your own words, the kind of structures that the query hT,Pi recog- nises. (b) Compute the semi-naive...

2. Consider the Datalog program P: T(x) + f(x), T(x) = a(x, y) A T(y) Ab(x, z) AT(2). (a) Describe, in your own words, the kind of structures that the query (T,P) recog- nises. [4 marks] (b) Compute...

1. [Derivation/ Conceptual] Consider the multiple linear regression model \" = X E + E' with the usual setup, where Y is the n x 1 column vector of responses, X is the n x (p + 1) matrix for the...

1. 3 2 Consider the function f(x) = x - 3x - 9x + 10, x (a) . Find the equation of the straight line passing through the maximum and minimum points of the graph y = f(x). (4) (b) Show that the point...

URGENT ANSWER WE FILE Paste N HOME EE INSERT DESIGN PAGE LAYOUT Cut Copy Format Painter Clipboard 8 SE 6 = C = L G Calibri (Body) 11 B I U abe X X E - A A Font Screen... 1 4 PAGE 1 OF 1 0 WORDS 03...

9.Suppose body temperature is Normally distributed with mean 31.42 and standard deviation 0.12. a)Find the probability that a randomly selected person has a body temperature below 31.27. b)Find the...

language is in c. Suppose you want to define variables a and b of type int, variable p of type pointer to int, and variable x of type pointer to pointer to int. Which of the following declarations...

Exercises: 1. Let A be the set of students who live within one mile of school and let B be the set of students who walk to classes. Describe the students in each of these sets. a) AnB b) A UB C) A -...

Need help on the wrong answers (c) Verify that 59 z 3.13513 3 9.918, b a 0.4966, and E a 73.000. s. a b ; (:1) Find the predicted percentage 9 of successful eld goais for a player with x = 69%...

Mickleson Golf Industries sells custom golf clubs and has an all-cash sales policy. They currently sell 1,200 clubs a month for $155 each. The variable costs per club are $125. They are analyzing...

This histogram shows the price in dollars of 218 used cars. (a) Suppose we converted the prices of these cars from dollars to euros, with an exchange rate of 1.2 dollars per euro. Describe the...

A front office tracks collections of cash by posting what

Question 24 (3 points) Identify the correct statement about the closing time. The close is the definitive part of the selling process. It does not take much to close a sale even with the wrong...

(Appendices) The Bureau of Labor Statistics provides detailed information on unemployment at the national, state, and local level. Go to www.bls.gov/lau/home.htm. See Latest Numbers and answer the...

(Appendices) Medicaid is a major public assistance program that provides health care to certain low-income individuals and families. Answer the following questions with respect to current Medicaid...

(Appendices) Jeremy, age 45, is the general manager of five fast-food restaurants. Each restaurant has a delivery service for customers who call in orders. Employees drive company cars to deliver the...