Database代写：CS420 Database Schema代做留学生JSP语言、R作业帮做

根据题目要求，代写完成四个场景下的数据库设计，包含E-R图，关系图以及UML图。Problem 1Consider the following database schema:Supplier(SName, ItemName, Price): supplier SName sells item ItemName at PriceCustomer(CName, Address): customer CName lives at Address.Order(CName, SName, ItemName, Qty): customer CName has ordered Qty of item ItemName from supplierSName.Item(ItemName, Description): information about items. Every item is supplied by some supplier.a. Draw the E-R diagram from which the above schema might have been derived. Specify the keys.b. Show how this ER diagram can be translated to the relational model.c. Draw the UML diagram.Problem 2Your local community library has books, CDs, tapes, and so forth, which are lent to library patrons. The latter have accounts, addresses, and so forth. If a loaned item is overdue, it accumulates penalty. Some patrons are minors, so they must have sponsoring patrons who are responsible for paying penalties (or replacing a book in case of a loss).a. Use the E-R approach to design a database system for your library.b. Show how this ER diagram can be translated to the relational model.c. Use the UML approach to design a database system for your library.Problem 3A real estate firm keeps track of the houses for sale and customers looking to buy houses. A house for sale can be listed with this firm or with a different one. Being “listed” with a firm means that the house owner has a contract with an agent who works for that firm. Each house on the market has price, address, owner, and a list of features, such as the number of bedrooms, bathrooms, type of heating, appliances, size of garage, and the like. This list can be different for different houses, and some features can be present in some houses but missing in others. Likewise, each customer has preferences that are expressed in the same terms (the number of bedrooms, bathrooms, etc.). Apart from these preferences, customers specify the price range of houses they are interested in. Perform conceptual design for this enterprise.a. Use the E-R approach to design a database system for the firm.b. Show how this ER diagram can be translated to the relational model.c. Use the UML approach to design a database system for the firm.Problem 4A supermarket chain is interested in building a decision support system with which they can analyze the sales of different products in different supermarkets at different times. Each supermarket is in a city, which is in a state, which is in a region. Time can be measured in days, months, quarters, and years. Products have names and categories (produce, canned goods, etc.).a. Design an E-R diagram for this application.b. Show how this ER diagram can be translated to the relational model.c. Use the UML approach to design a database system for the supermarket.Submit 1 PDF file with the responses to all the problems in order (1,2,3,4).本团队核心人员组成主要包括BAT一线工程师，精通德英语！我们主要业务范围是代做编程大作业、课程设计等等。我们的方向领域：window编程 数值算法 AI人工智能 金融统计 计量分析 大数据 网络编程 WEB编程 通讯编程 游戏编程多媒体linux 外挂编程 程序API图像处理 嵌入式/单片机 数据库编程 控制台 进程与线程 网络安全 汇编语言 硬件编程 软件设计 工程标准规等。其中代写编程、代写程序、代写留学生程序作业语言或工具包括但不限于以下范围:C/C++/C#代写Java代写IT代写Python代写辅导编程作业Matlab代写Haskell代写Processing代写Linux环境搭建Rust代写Data Structure Assginment 数据结构代写MIPS代写Machine Learning 作业 代写Oracle/SQL/PostgreSQL/Pig 数据库代写/代做/辅导Web开发、网站开发、网站作业ASP.NET网站开发Finance Insurace Statistics统计、回归、迭代Prolog代写Computer Computational method代做因为专业，所以值得信赖。如有需要，请加QQ：99515681 或邮箱：[email protected] 微信：codehelp