By Philip Greenspun
From the author of Travels With Samantha and The invoice Gates Wealth Clock! comes this name that web geeks will recognize good. straight away a booklet on how one can do websites the Greenspun method, and an intermediate/high finish instructional, this e-book indicates the way to enforce a Relational Database sponsored website.
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Extra resources for Database Backed Web Sites: The Thinking Person's Guide to Web Publishing
A medical history is made up of appointments and the events that occur during those appointments. Therefore, the history is really a collection of instances of appointment entities and medical treatment entities. The "history" is an output that a database application can obtain by gathering the data stored in the underlying entity instances. 18 ENTITIES AND DATA RELATIONSHIPS Documenting Logical Data Relationships Entity-relationship diagrams provide a way to document the entities in a database along with the attributes that describe them.
If a customer had three phone numbers, then there would be three instances of the phone number entity for the customer. The entity's identifier would be the concatenation of the customer number and the telephone number. Note: There is no way to avoid using the telephone number as part of the entity identifier in the telephone number entity. As you will come to understand as you read this book, in this particular case there is no harm in using it in this way. What is the problem with a multivalued attribute?
As you read earlier, however, attributes cannot be multivalued. This tells you that inventory cannot stand as an entity. It must be represented as a collection of instances of a merchandise item entity. As another example, consider a person's medical history maintained by a doctor. Like an inventory, a medical history is a collection of more than one entity. A medical history is made up of appointments and the events that occur during those appointments. Therefore, the history is really a collection of instances of appointment entities and medical treatment entities.
Database Backed Web Sites: The Thinking Person's Guide to Web Publishing by Philip Greenspun