A. 网上书店系统ER图怎么画
狭义的系统er图是database的对应关系图，
先把书店系统的db设计好，各个db之间怎么关联，怎么关联想清楚，就成了er图
B. 求一张在线论坛系统的ER图（急）
我给你一个图，但是我懒得用visio画了，都是重复工作，很容易画的，再说画出来贴到网络上也要变成非矢量图了，已经失去visio图的意义了
C. 什么叫ER图，什么叫系统流程图！请具体讲清楚
er是实体关系图，关系数据库设计时用的，系统流程图就是软件的逻辑流程，先干什么后干什么，两个根本不是一个东西
D. 网上购书系统ER图
The ER Model of the Bookseller System
Entities:
Customer: Username, Password, Age, Sex, Salary, Speciality, Address(Street, City, Postcode), E-mail, Tel, Mobilephone, FavType;
VIPUser: Username, Totalprice, Discount;
NormalUser: Username, Totalprice, Discount;
Book: BookID, Bookname, Author{Name(Fname, MI, Lname)}, ISBN(_________), Year, Pub, Type, Price, Discount, Number;
Stock: BookID, Number;
Oos: BookID, Number;
BookType: TypeID, Type, Nmuber;
Relationships:
Sell: <Customer, Book>, M:N, PARTIAL/PARTIAL, SNoBook(Sno, Username, BookID), Number, Price, Totalprice, WayofSend, FixDate, SendDate, GetDate;
Has: <Book, BookType>, N:1, TOTAL/PARTIAL;
Some Assumptions/Clarifications:
• Not all customers necessarily buy books. Not all books are necessarily sold.
• Not all booktypes need necessarily be of books. However, all books must have a booktype and only one booktype.
• If there is no book with a particular name, the book will be in the out of stock set. The others are in the stock set.
• The customer who has paid over 200 Yuan will be in the VIP set. The others are in the normal set.
图传不上去……
E. 我要做一个购物网站的毕设，谁会画ER图吗帮我画下谢谢
把你自己的内容构思写点出来嘛···什么类型的商品?
F. 购书管理系统ER图怎么设计
在网上找个ER设计软件! 最好是中文版的! 自己做一个! 应该不是很难!
G. 超市管理系统er图怎么画啊
可以具体一点吗？知道工厂系统erp