Learn SQL Database Programming

Query and manipulate databases from popular relational database servers using SQL

Josephine Bush

• Éditeur: Packt Publishing
• Année: 2020
• ISBN:
  9781838981709
• Édition: 1
• Sujet: Computer Science
• Sous-sujet: Programming in SQL

Learn everything you need to know to build efficient SQL queries using this easy-to-follow beginner's guide

Key Features

• Explore all SQL statements in depth using a variety of examples
• Get to grips with database querying, data aggregate, manipulation, and much more
• Understand how to explore and process data of varying complexity to tell a story

Book Description

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.

What you will learn

• Install, configure, and use MySQL Workbench to restore a database
• Explore different data types such as string, numeric, and date and time
• Query a single table using the basic SQL SELECT statement and the FROM, WHERE, and ORDER BY clauses
• Query multiple tables by understanding various types of table relationships
• Modify data in tables using the INSERT, UPDATE, and DELETE statements
• Use aggregate functions to group and summarize data
• Detect bad data, duplicates, and irrelevant values while processing data

Who this book is for

This book is for business analysts, SQL developers, database administrators, and students learning SQL. If you want to learn how to query and manipulate SQL data for database administration tasks or simply extract and organize relevant data for analysis, you'll find this book useful. No prior SQL experience is required.

Section 1: Database Fundamentals

The objective of this section is to introduce you to relational database management systems, how to set up and use MySQL Workbench, how to use data types, how to design and create a database, and how to import and export data.

This section comprises the following chapters:

• Chapter 1, Introduction to Relational Database Management Systems
• Chapter 2, Installing and Using MySQL Workbench
• Chapter 3, Understanding Data Types
• Chapter 4, Designing and Creating a Database
• Chapter 5, Importing and Exporting Data

Introduction to Relational Database Management Systems

This chapter introduces the concepts required to understand the basics of relational database management systems (RDMS). It will introduce foundational topics such as SQL, the relational model, data integrity, database normalization, and the types of relational database management systems. It will provide you with fundamental knowledge about SQL and databases that will be required throughout this book.

In this chapter, we will cover the following topics:

• Understanding SQL
• Understanding databases
• Understanding data integrity
• Understanding database normalization
• Types of RDMS

Understanding SQL

Structured Query Language, or SQL (pronounced see-quel), is the language that is used for querying and manipulating data and defining structures in databases. Initially developed at IBM in the early 1970s, SQL became an ANSI and ISO standard in 1986.

SQL is a powerful, yet simple language, and can do many things, such as execute queries, retrieve, insert, update, and delete data, create databases and tables, and much more.

These types of activities can be grouped into different subdivisions of SQL: Data Definition Language (DDL), Data Manipulation Language (DML), and Data Control Language (DCL):

• Use DDL commands to specify database schema:
• CREATE: This is used to create a new database or objects in a database.
• ALTER: This is used to alter a database or objects in a database.
• DROP: This is used to delete a database or objects in a database.
• TRUNCATE: This is used to remove all data from a table instantaneously.
• Use DML commands to query and modify data:
• SELECT: This is used to retrieve data from a database.
• INSERT: This is used to insert data into a database.
• UPDATE: This is used to update data in a database.
• DELETE: This is used to remove data from a database.
• Use DCL commands to control permissions and translations:
• GRANT: This is used to give access to a user.
• REVOKE: This is used to take access away from a user.
• COMMIT: This is used to save changes in a transaction.
• ROLLBACK: This is used to remove the saved changes in a transaction.

You won't learn about GRANT and REVOKE in this book. To get more information on granting and denying permissions, please visit https://dev.mysql.com/doc/refman/8.0/en/grant.html and https://dev.mysql.com/doc/refman/8.0/en/revoke.html.

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