SQL Server works on the principle of RDBMS. This means that tables and data can be related to each other, and in fact should be. We'll work with some of these relationships in designing the architecture of our application in the next chapter. Also, it's important that you have an idea of what entities and relationships are, and how they work.
In database terms, an entity is a specific object having features, called attributes, which can be used to describe it. You are an entity. Your attributes include your first name, last name, email address, phone number, and shoe size. Some attributes are important—you would probably like your users' names and email addresses—while others are less important. Unless you run the web site of the International Association of Web Developers with Two Left Feet, probably you won't care about your users' shoe size. But the Nike retail web site may be very concerned about shoe size. The attributes in your database, called...