Answered: 2a - Determine the precondition for the…

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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Question

2a - Determine the precondition for the following sequence of expressions. Please provide all your work including calculations, and final answer.

2b - Determine the strongest precondition for the following if-else statement. Please provide all your work including calculations, logic implications if any applies, and final answer.

{?) a = 4* (3* b-a); b = 4 * a -6; {b > 10}

{?}
if (x > y)
else if (x < y)
else
{y > 15}
y=x-5
y = x + 8
y = 3x

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