8. Which expression is equivalent to: not x and y == a and b? Which expression is equivalent to: not x and y == a and b? Pick ONE option (not (x and y)) == (a and b) ((not x) and y) and (a and b) not ((x and (y == a)) and b) ((not x) and (y == a)) and b

8. Which expression is equivalent to: not x and y == a and b? Which expression is equivalent to: not x and y == a and b? Pick ONE option (not (x and y)) == (a and b) ((not x) and y) and (a and b) not ((x and (y == a)) and b) ((not x) and (y == a)) and b

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Control structures

Control structures are block of statements that analyze the value of variables and determine the flow of execution based on those values. When a program is running, the CPU executes the code line by line. After sometime, the program reaches the point where it has to make a decision on whether it has to go to another part of the code or repeat execution of certain part of the code. These results affect the flow of the program's code and these are called control structures.

Switch Statement

The switch statement is a key feature that is used by the programmers a lot in the world of programming and coding, as well as in information technology in general. The switch statement is a selection control mechanism that allows the variable value to change the order of the individual statements in the software execution via search.

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8. Which expression is equivalent to: not x and y == a and b?
Which expression is equivalent to: not x and y == a and b?
Pick ONE option
(not (x and y)) == (a and b)
((not x) and y) and (a and b)
not ((x and (y == a)) and b)
((not x) and (y == a)) and b
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QUESTION 11 Consider the following statements: T(x, y): "x eats y". A(x): "x is wise". S(x): "x is hungry". F(y): "y is fat". H(y): "y is healthy". The domain of x is the set of all people and the domain of y is the set of all food. Select the symbolic of the following sentence (one or more answers): "All healthy food are eaten by all wise people" None of all proposed answers Vx Vy T(x,у) — (х) V -Н(у) Vx Vy ¬T(x,y) →A (x) V H (y) Vx Vy -T(x,y) v ¬A (x) V ¬H (y) Vx Vy -T(x,y) → ¬A (x) V ¬H (y)
Complete the following sentence. operators are operators that compare two numbers and produce a true or false result. For example, a > b contains such an operator that compares the numbers in variables a and b. If the value in a is greater than the value in b, then this operator returns a true result. Otherwise, the operator returns a false result.
True or False: for each of the following statements, decide if it is true or false. If it istrue, then provide a proof; if it is false, provide a counterexample.(a) For events A, B, it is always the case that Pr(Bn.A) < Pr(B).(b) For events A, B with Pr(A) > 0, it is always the case that Pr(B | A) < Pr(B).
Given the total required amount and the same members representing the amount of change in it in your pocket, decide whether you can afford it or not thing. Change will always be represented as follows: quarters, dimes, nickels, pens. Illustration: change Enough ([25, 20, 5, 0], 4.25) should show true, as it has 25 quarters, 20 dimes, 5 nickels and 0 pens gives you 6.25 +2+.25 + 0 = 8.50. Examples changeEnough ([2, 100, 0, 0], 14.11) → false - changeEnough ([0, 0, 20, 5], 0.75) → true changeEnough ([30, 40, 20, 5], 12.55) → truth
Question 7 PS:Please choose the right answer only.
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