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


In this chapter, you learned how to use aggregate functions to group and summarize data. Aggregate functions include math functions such as AVG, SUM, COUNT, MIN, and MAX. They also include statistical functions such as STDDEV and VARIANCE.

You learned how to use GROUP BY with and without aggregate functions to summarize data. You also learned how to filter summarized data with the HAVING clause. Then, you learned the difference between the HAVING and WHERE clauses.

Finally, you learned how MySQL actually executes your query clauses. It's not about the order you write the clauses in, but writing them in a different order that explains why you can't use aliases in all the clauses of the SQL statement.

In the next chapter, you will learn how to use advanced querying techniques. By the end of the next chapter, you will be able to understand what types of subqueries...