triple (X, XXX) - append (X, X, XX), append (XX, X, XXX). The rule above checks if X triples into XXX. For example, if X=[1,2,3], this will produce [1, 2, 3, 1, 2, 3, 1, 2, 3] in XXX. Rewrite this rule so that for X=[1, 2, 3], XXX is equal to [1, 1, 1, 2, 2, 2, 3, 3, 3].
triple (X, XXX) - append (X, X, XX), append (XX, X, XXX). The rule above checks if X triples into XXX. For example, if X=[1,2,3], this will produce [1, 2, 3, 1, 2, 3, 1, 2, 3] in XXX. Rewrite this rule so that for X=[1, 2, 3], XXX is equal to [1, 1, 1, 2, 2, 2, 3, 3, 3].
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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