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The SQL Workshop

You're reading from   The SQL Workshop Learn to create, manipulate and secure data and manage relational databases with SQL

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Product type Paperback
Published in Dec 2019
Publisher Packt
ISBN-13 9781838642358
Length 288 pages
Edition 1st Edition
Languages
Concepts
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Authors (3):
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Prashanth Jayaram Prashanth Jayaram
Author Profile Icon Prashanth Jayaram
Prashanth Jayaram
Frank Solomon Frank Solomon
Author Profile Icon Frank Solomon
Frank Solomon
Awni Al Saqqa Awni Al Saqqa
Author Profile Icon Awni Al Saqqa
Awni Al Saqqa
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Table of Contents (13) Chapters Close

Preface 1. SQL Basics FREE CHAPTER 2. Manipulating Data 3. Normalization 4. The SELECT Statement 5. Shaping Data with the WHERE Clause 6. JOINS 7. Subqueries, Cases, and Views 8. SQL Programming 9. Security 10. Aggregate Functions 11. Advanced SQL Appendix

Introduction

In the previous chapters, we saw that the WHERE clause can be used to filter SQL query result sets in an efficient, almost intuitive way. For example, say we want to identify the total number of executives in a department, or we want the total number of dependents who are covered by a medical claim. In such cases, more than the details, we are looking for a single calculated value. For such cases, where we need calculated results based on database rows, we use SQL aggregate functions. They can also be used to calculate values across subsets of query result rows. We will also look at advanced clauses, such as the GROUP BY and the HAVING clauses, and see how they can help us to fine-tune our results.

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