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Sketch an object-oriented model for a small private airport database that is used to keep track of airplanes, their owners, airport employees, and pilots. From the requirements for this database, the following information was collected. Each airplane has a registration number [Reg#], is of a particular plane type [OF-TYPE], and is stored in a particular hangar [STORED-IN]. Each plane type has a model number [Model], a capacity [Capacity], and a weight [Weight]. Each hangar has a number [Number], a capacity [Capacity], and a location [Location]. The database also keeps track of the owners of each plane [OWNS] and the employees who have maintained the plane [MAINTAIN]. Each relationship instance in OWNS relates an airplane to an owner and includes the purchase date [Pdate]. Each relationship instance in MAINTAIN relates an employee to a service record [SERVICE]. Each plane undergoes service many times; hence, it is related by [PLANE-SERVICE] to a number of service records. A service record includes as attributes the date of maintenance [Date], the number of hours spent on the work [Hours], and the type of work done [Workcode]. We use a weak entity type [SERVICE] to represent airplane service, because the airplane registration number is used to identify a service record. An owner is either a person or a corporation. Hence, we use a union category [OWNER] that is a subset of the union of corporation [CORPORATION] and person [PERSON] entity types. Both pilots [PILOT] and employees [EMPLOYEE] are subclasses of PERSON. Each pilot has specific attributes license number [Lic-Num] and restrictions [Restr]; each employee has specific attributes salary [Salary] and shift worked [Shift]. All person entities in the database have data kept on their social security number [Ssn], name [Name], address [Address], and telephone number [Phone]. For corporation entities, the data kept includes name [Name], address [Address], and telephone number [Phone]. The database also keeps track of the types of planes each pilot is authorized to fly [FLIES] and the types of planes each employee can do maintenance work on [WORKS-ON].
What is the key value of the 4th index record on the top level, assuming each index record points to the record with the highest key value in a block of the next level down?
Write a program that will ask the user to enter the last names of our candidates in a class officer's president election and the number of votes received each candidate.
Course: data mining. Require a 7 page essay on subjects: Warehouse Architectures: the paper requires to contain information about centralized, federated, and tiered data warehouse.
Your task is to develop a database to support this activity.Here is what you need to be able to provide Custom Auto Body in order to land your first consulting contract:
Difference between obsolescent and redundant stocks
Create a function that returns the day of the week for a specified date. Create a trigger that displays the message "Emp table updated" when an update to the employee table increases the employee's basic salary.
From information system point of view, we should take the key functions of organization and map them to strategic information. Do your companies follow this process or are steps skipped?
The DBA denormalized some of the data in the Premiere Products database to improve performance. Which field or fields cause the table to no longer be in third normal form? In which normal form is the denormalized table?
What is the maximum rate at which data can be read from disk, assuming that we can only read data from one surface at a time? What is the average rotational latency?
Write a command to list all the employees hired in 2003 and 2004. Sort the rows by the hire_date column in descending order.
A small business with 100 computer workstations is installing a new local area network. All of the users perform the usual operations of e-mail. State your reasoning. Draw a floor plan for each If possible, show both floor plans on one page.
Views are integral part of virtual private databases, yet views are utilized for many other reasons. Find out many other uses for views.
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