正在加载图片...
Example of a Nested Relation Example:library information system Each book has title, a list(array)of authors, Publisher,with subfields name and branch,and a set of keywords Non-1NF relation books title author_array publisher keyword_set (name,branch) Compilers [Smith,Jones] (McGraw-Hill,New York) [parsing,analysis} Networks [Jones,Frick] (Oxford,London) [Internet,Web Database System Concepts-6th Edition 22.5 ©Silberschat乜,Korth and SudarshanDatabase System Concepts - 6 22.5 ©Silberschatz, Korth and Sudarshan th Edition Example of a Nested Relation Example: library information system Each book has title, a list (array) of authors, Publisher, with subfields name and branch, and a set of keywords Non-1NF relation books
<<向上翻页向下翻页>>
©2008-现在 cucdc.com 高等教育资讯网 版权所有