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

Creating and using functions

You can create user-defined functions in MySQL. These are used to extend the functionality of MySQL, and they work much the same as other built-in functions work. As you may recall, built-in functions are things such as SUM() or AVG().

Understanding the difference between a function and a stored procedure

A function differs from a stored procedure in many ways, as shown in the following table:


Stored procedure

Returns only one mandatory value

Can return zero, one, or multiple values

Doesn't allow transactions

Allow transactions

Can be used in SELECT, WHERE, and HAVING clauses

Can't be used in SELECT, WHERE, and HAVING clauses

Only allows input parameters...