Book Image

Learn SQL Database Programming

By : Josephine Bush
5 (1)
Book Image

Learn SQL Database Programming

5 (1)
By: Josephine Bush

Overview of this book

SQL is a powerful querying language that's used to store, manipulate, and retrieve data, and it is one of the most popular languages used by developers to query and analyze data efficiently. If you're looking for a comprehensive introduction to SQL, Learn SQL Database Programming will help you to get up to speed with using SQL to streamline your work in no time. Starting with an overview of relational database management systems, this book will show you how to set up and use MySQL Workbench and design a database using practical examples. You'll also discover how to query and manipulate data with SQL programming using MySQL Workbench. As you advance, you’ll create a database, query single and multiple tables, and modify data using SQL querying. This SQL book covers advanced SQL techniques, including aggregate functions, flow control statements, error handling, and subqueries, and helps you process your data to present your findings. Finally, you’ll implement best practices for writing SQL and designing indexes and tables. By the end of this SQL programming book, you’ll have gained the confidence to use SQL queries to retrieve and manipulate data.
Table of Contents (24 chapters)
Section 1: Database Fundamentals
Section 2: Basic SQL Querying
Section 3: Advanced SQL Querying
Section 4: Presenting Your Findings
Section 5: SQL Best Practices

Understanding indexes

This section will take the reader through an explanation of what indexing is, how it relates to data integrity, and how it impacts performance.

Indexing is a method of optimizing database performance to boost the speed of database queries. Indexes are placed on column(s) in a table. Tables can have more than one index, but there tends to be an optimal number of indexes before indexes impair performance instead of helping it. The optimal number can vary depending on the table. This is why index tuning can be an art as well as a science. To properly index a table, you need an understanding of how to streamline the process of query results that are returned to a user.

It's good to plan out the indexing that you will need before adding data, if possible. When you add an index to an empty table, it adds it pretty much instantaneously. It can take quite a...