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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

SQL

SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.

Queries

A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.

Question

Jump to level 1
Assume that lower numbers have higher priority and that a priority queue numPQueue currently
holds items: 13, 34, 48, 56 (front is 13).
Where does Enqueue(numPQueue, 34) add an item?
Select
Where does Enqueue(numPQueue, 11) add an item?
Select
Where does Enqueue(numPQueue, 53) add an item?
Select
Select
After 13
After 34
After 48
At head of queue
2
3
5
At tail of queue
Next
Check

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