My SQL
he modern solution to this problem is the database. A single entry is made for each country, for example, in a reference list that might be called the Country table. When someone needs to indicate the United Kingdom, he only has one choice available to him from the list: a single entry called &qu...
Đã lưu trong:
| Tác giả chính: | |
|---|---|
| Định dạng: | Sách |
| Ngôn ngữ: | English |
| Được phát hành: |
Global Media
2011
|
| Những chủ đề: | |
| Truy cập trực tuyến: | http://scholar.dlu.edu.vn/thuvienso/handle/DLU123456789/25877 |
| Các nhãn: |
Thêm thẻ
Không có thẻ, Là người đầu tiên thẻ bản ghi này!
|
| Thư viện lưu trữ: | Thư viện Trường Đại học Đà Lạt |
|---|
| Tóm tắt: | he modern solution to this problem is the database. A single entry is made for each
country, for example, in a reference list that might be called the Country table. When
someone needs to indicate the United Kingdom, he only has one choice available to him
from the list: a single entry called "United Kingdom". In this example, "United Kingdom"
is the unique representation of a country, and any further information about this country
can use the same term from the same list to refer to the same country. For example, a list
of telephone country codes and a list of European castles both need to refer to countries;
by using the same Country table to provide this identical information to both of the new
lists, we've established new relationships among different lists that only have one item in
common: country. A relational database, therefore, is simply a collection of lists that
share some common pieces of information. |
|---|