Assuming that most of you are existing WordPress developers, you will have a solid understanding of an existing database table structure. However, I suggest that you continue with this section as web applications can have a different perspective on using these tables. Based on the functionality, we will categorize the existing tables into four sections as follows:

Let's look at how each table fits into these categories and their roles in web applications.

User-related tables

This section consists of two tables for keeping the user-related information of your application. Let's take a look at the relationship between user-related tables before moving onto the explanations.

The two tables shown in the preceding diagram are as follows:

• wp_users: All the registered users will be stored in this table with their basic details such as name, e-mail, username, password, and so on.

• wp_usermeta: This...