个人中心
文章发布
退出
作者热门文章
- Java 双重比较
- java - 比较器与 Apache BeanComparator
- Objective-C 完成 block 导致额外的方法调用？
- database - RESTful URI 是否应该公开数据库主键？
25
4
<分区>
我已经为一项作业制作了错误图和规范化表格(包括规范化的所有步骤)。有人可以告诉我它是否正确，如果不正确，请告诉我我哪里出错了
谢谢
这是案例研究
The CabsOnDemand Case Study:
A private taxi company called CabsOnDemand was established in Kathmandu in 2002. Since then, the company has grown steadily and now has offices in most of the main cities of Nepal. However, the company is now so large that more and more administrative staff are being employed to cope with the ever-increasing amount of paperwork. Furthermore, the communication and sharing of information within the company is poor. The Director of the company, Sanjiv Udash feels that too many mistakes are being made and that the success of his company will be short-lived if he does not do something to remedy the situation. He knows that a database could help in part to solve the problem and has approached you and your team to help in creating a database application to support the running of CabsOnDemand.
The Director has provided the following brief description of how CabsOnDemand operates.
Each office has a Manager, several taxi owners, drivers and administrative (Regular) staff. The Manager is responsible for the day-to-day running of the office. An owner provides one or more taxis to CabsOnDemand and each taxi is allocated to number of drivers for use. The majority of owners are also drivers themselves. For each taxi details such as vehicle Registration Number, model, make, colour, capacity, currentMileage, DueDate for mortgage are recorded.
For each staff, Staff Number, National Insurance Number, Address, Date of Birth, First Name, Last Name, Salary, Sex are recorded.
Each office is identified by unique number, it's location details, telephone and fax numbers are recorded.
Office issues contracts for clients and should record details of the contracts. Each contract is identified unique contract number, date at which contract was signed, it's completion time, total charge for contract signing and maximum number of job allocated are recorded.
CabsOnDemand taxis are not available for hire by the public hailing a taxi in the street but must be requested by first phoning the company to attend a given address. This request is treated as job and each job has to be identified uniquely too also all the details such as pick-up date, location, time, drop-off location, used mileages and total chargeable amount should be recorded.
There are two kinds of clients, namely private and business. The business provided by private clients is on an ad-hoc basis. During the first booking each client is given unique identity and other his/her's other details such as address information, name, contact details are collected.
However, the business provided by business clients is more formal and involves agreeing a contract of work with the business. A contract stipulates the number of jobs that CabsOnDemand will undertake for a fixed fee hence, extra details such as client's business type, fax numbers are recorded too.
As described above, when a job comes into CabsOnDemand the name, phone number and contract number of the client is taken and then the pick-up date/time and pick-up/drop-off addresses are noted. Each job is allocated a unique jobID. The nearest driver to the pick-up address is called on His/Her mobile and the job details is informed.
When a job is completed the driver should note the mileage covered or used and the charge made (for private clients only). If a job is not complete, the reason for the failed job should be note.
The Director has provided some examples of typical queries that the database application for CabsOnDemand should be able to answer once implemented.
25
4
0
我需要根据需要动态设置文本区域，但它不想正常工作。 JQuery 会自行检查，但无法检查是否已检查。但是当您在第二个单选框内单击时，始终需要文本区域。我尝试了很多次让它工作，但它仍然有问题。我添加了“
我需要在 Django 中进行 API 调用(某种形式)，作为我们所需的自定义身份验证系统的一部分。用户名和密码通过 SSL 发送到特定 URL(对这些参数使用 GET)，响应应该是 HTTP 200
我将在我的可移植 C 代码中使用 #warning 来生成编译时警告。但并非所有平台都支持 #warning。有什么方法可以找到该平台是否支持 #warning。 #ifdef warning
我编写了一个函数来检查某个数字是否存在于某个区间内。停止搜索的最佳方法是什么？这个: for (i = a; i <= b; i++) { fi = f(i); if (fi == c) {
我想知道在 c 中是否有一种方法可以检查，例如在 for 函数中，如果变量等于或不等于某些字符，而不必每次都重复进行相等性检查。如果我没记错的话，以这种方式检查相等性是不正确的: if (a == (
我有如下日志功能 void log_error(char * file_name, int line_num, int err_code) { printf("%s:%d:%s\n", fil
使用 ssh-keygen 生成的 key 对在 macOS 上可以有不同的格式。 macOS 可读的标准 PEM ASN.1 对象 SecKey API 带有文本标题的 PEM OpenSSH ke
我正在尝试编写一个 excel if 语句。我不熟悉使用 Excel 具有的所有额外功能。我正在使用一个名为 importXML() 的函数.我正在尝试检查我正在使用的函数是否生成“#VALUE!”错
有没有办法检查是否没有 AIO 写入给定文件？我在我的 Unix 类(class)上制作了一个项目，该项目将是一个上下文无关(基于 UDP)的国际象棋服务器，并且所有数据都必须存储在文件中。应用程序将
我有一个如下所示的函数: public Status execute() { Status status = doSomething(); if (status != Stat
我正在使用 Composer，我不希望 PhpStorm 在 vendor 文件夹上运行任何错误检查或检查，因为它对 vendor/中的某些代码显示误报composer/autoload_static
Chapel 的一个很好的特性是它区分了数组的域和它的分布。检查两个数组是否具有相同的域和分布(通常想要的)的最佳方法是什么？ 我能看到的最好的方法是检查 D1==D2和 D1.dist==D2.di
在我的 JavaScript 函数中，我为所有输入、文本区域和选择字段提供实际值作为 initial_value: $('input, textarea, select').each(function
我正在编写一个分解为几个简单函数的 PHP 类。在构造函数中，它调用另一个名为 processFile 的函数。该函数调用 5 个私有(private)函数并进行检查。如果检查失败，它会将消息分配给
这个问题已经有答案了: How to detect if user it trying to open a link in a new tab? (2 个回答) 已关闭 7 年前。 我认为 JavaS
我正在浏览我们的代码库并看到很多这样的测试: declare @row_id int = ... declare @row_attribute string select @row_attribu
我正在声明一个用作比较的函数。我的问题是: 为什么条件充当语句？ 为什么第 4 行可以工作，而第 5 行却不行？ 我知道这段代码不切实际且未使用，但为什么编译器允许这种语法？ 谷歌没有找到答案。但话又
到目前为止，我有一个带有空文本字段的 PHP Kontaktform，并使用以下命令检查了所需的字段: $name = check_input($_POST['name'], "请输入姓名。"); 现
目前，我能想到的合理检查的唯一方法没有臃肿的逻辑: if ( $value > 0 ) { // Okay } else { // Not Okay } 有没有更好的办法？ 最佳答案
我正在尝试运行一个脚本，如果 i 存在(意味着存在 i 值，任何值)或其他部分，我希望运行其中的一部分如果i没有值就运行，有人可以启发我吗？ 我说的是 for 循环，比如 for (var i=0;
我是一名优秀的程序员,十分优秀！