TAILIEUCHUNG - Beginning Database Design- P6

Beginning Database Design- P6:This book focuses on the relational database model from a beginning perspective. The title is, therefore, Beginning Database Design. A database is a repository for data. In other words, you can store lots of information in a database. A relational database is a special type of database using structures called tables. Tables are linked together using what are called relationships. You can build tables with relationships between those tables, not only to organize your data, but also to allow later retrieval of information from the database | 4 Understanding Normalization There are two rules in life Rule 1 Don t sweat the small stuff. Rule 2 Everything is small stuff. Finn Taylor Life is as complicated as we make it normalization can be simplified. This chapter examines the detail of the normalization process. Normalization is the sequence of steps by which a relational database model is both created and improved upon. The sequence of steps involved in the normalization process is called Normal Forms. Essentially Normal Forms applied during a process of normalization allow creation of a relational database model as a step-by-step progression. Previous chapters have examined history and applications plus various other factors involved in database model design. Chapter 3 introduced all the parts and pieces involved in a relational database model. This chapter now uses the terminology covered in Chapter 3 and explains how to build a relational database model. Subsequent chapters examine more advanced details of relational database modeling such as denormalization and SQL both of which depend on a good understanding of normalization. This chapter describes the precise steps involved in creation of relational database models. These steps are the 1st 2nd and 3rd Normal Forms plus the rarely commercially implemented Boyce-Codd 4th 5th and Domain Key Normal Forms. The Normal Forms steps are the progressive steps in the normalization process. In this chapter you learn about the following Anomalies Dependency and determinants Normalization A layman s method of understanding normalization Chapter 4 A purist academic definition of normalization 1st 2nd 3rd Boyce-Codd 4th 5th and Domain Key Normal Forms Normalization and referential integrity as expressed by primary and foreign keys What Is Normalization The academic definition of normalization is the accepted format of Normal Forms definition. I like to label normalization as academic because the precise definitions of Normal Forms are often misunderstood in a .

TAILIEUCHUNG - Chia sẻ tài liệu không giới hạn
Địa chỉ : 444 Hoang Hoa Tham, Hanoi, Viet Nam
Website : tailieuchung.com
Email : tailieuchung20@gmail.com
Tailieuchung.com là thư viện tài liệu trực tuyến, nơi chia sẽ trao đổi hàng triệu tài liệu như luận văn đồ án, sách, giáo trình, đề thi.
Chúng tôi không chịu trách nhiệm liên quan đến các vấn đề bản quyền nội dung tài liệu được thành viên tự nguyện đăng tải lên, nếu phát hiện thấy tài liệu xấu hoặc tài liệu có bản quyền xin hãy email cho chúng tôi.
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.