代做SQL实验作业、数据库编程代写、代做SQL实验作业、Database 编程作业帮做

CS990 Database Fundamentals. 1. Aim Of The Assignment: Your task during the classwork is to design and construct a database and use it to store and retrieve data. This is an individual task and must be accomplished without collaboration or collusion. 2. Task: Read the following description of a data model. From the specification, produce a logical design for the database, the SQL code to construct and populate the tables with a minimal amount of data that is needed to carry out the queries specified. The database must be built using Oracle. A database is required to store information concerning a manufacturing company as follows: The company maintains a series of factories at which it manufactures products. Each factory has a unique factory number as well as an address and telephone number. Each factory has a manager, who can be identified by her/his staff number. Managers are employees of the manufacturing company and all have a qualification. The company also employs secretaries, although secretaries are not assigned to factories. One secretary is designated as the supervisor of the other secretaries. All secretaries have staff numbers. A record is required of each employees name and home telephone number. In addition, for secretaries, the administrative grade is also recorded. A manager is responsible for only one factory and each factory has one manager. Each factory has several vehicles that it uses. Each vehicle has a registration number and details of the make and model also need to be recorded. Routine maintenance is carried out by one of the larger factories. Such large factories have a status of regional centre, as opposed to other factories that have a status of local centre. A vehicle is always maintained by the same factory. Some factories don’t have vehicles assigned to them and some vehicles are not assigned to factories. An enhanced entity relationship model was developed to represent the database and included the following entities, attributes and relationships: Entity meaning: Employee. A super-type for the employees of the company. Manager. A sub-type for the managers of the company. Secretary. A sub-type for the secretaries. Factory. A super-type for the factories owned by the company. Regional. Sub-type for the regional centres. Local. Sub-type for the local centres. Vehicle. The vehicles owned by the company. List of entities and their attributes: Employee(Esnum, Ename, Ephone) Manager(Esnum, Qualification) Secretary(Esnum, Sadmin) Factory(Fnum, Faddr, Ftel) Regional(Fnum) Local(Fnum) Vehicle(Vreg, Vmake, Vmodel) Relationship Relationship name Entities Degree Optionality Assigned Manager, Factory 1:1 Obligatory on both Has Factory, Vehicle 1:N Obligatory on neither Maintains Regional, Vehicle 1:N Obligatory on both Supervises Secretary, Secretary 1:N Obligatory on neither Assumptions: All regional centres maintain at least one vehicle. All employees are secretaries or managers EER diagram. 3. Logical design Table structures should be written down in the following format: TABLE_NAME(Primary-key-attribute,Non-key-attribute1, Non-key-attribute2.....). Using the enhanced entity relationship model from Section 4.1, write down a table structures for each entity taking care that: • each attribute becomes a column. • the unique identifier becomes the primary key and is indicated by underlining • subtype/supertype entities are represented in one of three methods described in the lectures Use Table CW-1 as a guide to the way of representing the relationships between entities. Write down table structures or modify existing structures to represent relationships in the system. 4 Creating and loading the database Use appropriate integrity constraints. Populate each table with a limited set of data i.e. only enough to show that the queries work. 5 Querying the database You now need to write some queries on your database. The queries must be useful queries and not artificially constructed simply to fulfil the criteria listed. All queries require a WHERE clause of the form. ‘…WHERE ATTRIBUTE = Value…’ to limit the rows returned (Value can be a text, numeric or date value). Write SQL statements that will (i) carry out a join between two tables and use the group by clause. (ii) execute a sub-query. (iii) execute a correlated-query. (iv) carry out a self join that uses primary key/foreign key attributes. The output of Oracle SQL queries can be captured in a file by typing: spool outfile at the SQL prompt. All screen output is then copied to a file with the name outfile.lst. The spooling can be stopped by typing: spool off& at the SQL prompt 6. Submission Your submission should consist of the following. i) A list of the table structures produced by logical design showing the attributes and primary keys. (15 %) ii) The SQL create statements (including the specification of integrity constraints) for creating the tables. (25%) iii) The SQL insert statements for populating the tables with a small sample of data. (15%) iv) The SQL queries listed in Section 4.5 together with a narrative explanation of each query (do not paraphrase the SQL commands) and its output. (25%) v) A 200 word critique of your database, highlighting the strengths and weaknesses of your solution and giving reasons for decisions that you have taken in the design and implementation. (20%) Items (i) to (v) should be combined into a single document and submitted through the Turnitin link on the class Myplace page. The document must not be zipped. All work will be evaluated for originality. Submission must be completed by 5.00pm on Friday 2nd March 2018. This exercise is worth 25% or the overall marks for this module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 QQ：99515681 或邮箱：[email protected] 微信：codehelp