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SQL for Data Analytics

You're reading from   SQL for Data Analytics Harness the power of SQL to extract insights from data

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Product type Paperback
Published in Aug 2022
Publisher Packt
ISBN-13 9781801812870
Length 540 pages
Edition 3rd Edition
Languages
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Authors (4):
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Benjamin Johnston Benjamin Johnston
Author Profile Icon Benjamin Johnston
Benjamin Johnston
Matt Goldwasser Matt Goldwasser
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Matt Goldwasser
Jun Shan Jun Shan
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Jun Shan
Upom Malik Upom Malik
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Upom Malik
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Toc

Table of Contents (11) Chapters Close

Preface 1. Understanding and Describing Data 2. The Basics of SQL for Analytics FREE CHAPTER 3. SQL for Data Preparation 4. Aggregate Functions for Data Analysis 5. Window Functions for Data Analysis 6. Importing and Exporting Data 7. Analytics Using Complex Data Types 8. Performant SQL 9. Using SQL to Uncover the Truth: A Case Study Appendix

8. Performant SQL

Overview

In this chapter, you will learn how to optimize a database to allow queries to be executed with fewer resources. First, you will look at how a database engine performs basic queries by developing your understanding of sequential scans. After that, you will look at optimizing SELECT queries by creating indexes on database tables, which improve performance. You will also learn about tools and techniques for terminating inefficient queries that are consuming your database resources. After all this, you will explore advanced functionalities by creating custom functions for special computations and examine how to apply custom constraints to your database by using triggers.

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