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Lesson 11 - MySQL Step By Step: Structure Change, Transactions and Views

In the previous lesson, MySQL Step By Step: Subqueries, we learned to use subqueries. Today, we're going to show how to change the structure of an existing database, we'll use transactions and views.

Changing the database structure

MySQL allows us to change the structure of an existing database while keeping the existing data in it. We do it by the ALTER statement.

Changing the table structure

We can do several changes to a table. To add, change, and remove columns, is now the most important for us. Let's add a new thumbs_up column to the comment table, so our visitors can rate the comments:


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Article description

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In this tutorial, we'll learn how to modify the MySQL database structure (mainly tables) using the ALTER statement, explain transactions, and create views.

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Article has been written for you by David Capka
The author is a programmer, who likes web technologies and being the lead/chief article writer at He shares his knowledge with the community and is always looking to improve. He believes that anyone can do what they set their mind to.
Unicorn university David learned IT at the Unicorn University - a prestigious college providing education on IT and economics.