How could one even begin to describe such a scene? When we say "perspective," what do we mean exactly? Does the data that is described in a view definition ever really exist in the format that is described there? When a user accesses a database by way of a view, what kinds of outcomes may often be anticipated?

How could one even begin to describe such a scene? When we say "perspective," what do we mean exactly? Does the data that is described in a view definition ever really exist in the format that is described there? When a user accesses a database by way of a view, what kinds of outcomes may often be anticipated?

Principles of Information Systems (MindTap Course List)

12th Edition

ISBN:9781285867168

Author:Ralph Stair, George Reynolds

Publisher:Ralph Stair, George Reynolds

Chapter5: Database Systems And Applications

Section: Chapter Questions

Problem 4PSE: Using a graphics program, develop an entity-relationship diagram for a database application for an...

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The ______________ model is a simple but highly useful way to organize data into collections of two-dimensional tables called relations.
What exactly is the meaning of the term "point of view"? What exactly is the meaning of the term "view"? Is it ever the case that the data that is declared to exist in a view definition really does appear in that view's description using the type that was given? What takes place when information is entered into a database by utilising a view as the entry point?
The difference between a database and an information system is that a database records information while an information system utilizes it. Is there any effect on database design with this relationship?
How exactly would one go about describing the scenery? When we speak about a "perspective," what exactly do we mean by that phrase? Does the data that is defined in a view ever truly exist in the format that is defined for that view? What types of results may often be expected when a user accesses a database by means of a view?
Draw the ER diagram based on the following specification. A tutorial school is using a database to manage information about teachers, courses, and students. Each teacher is identified by staff_id, has a name, an email address, and a phone number. Each student is identified by student_id, has a name, an email address, and a registration date. Each course is identified by course_id, year, and semester. In addition, each course has a name. Each course is associated with multiple lessons. A lesson has a lesson number, a location, a date, a start-time, and an end-time. Lesson numbers are sequentially numbers, starting from 1, generated separately for each course. Each teacher teaches at least one course. Each student takes at least one course. Each course is taught by one teacher. Each course can be taken by many students.
In a database, an entity is a collection of characteristics. An entity might be a tangible thing that exists in our world.Each entity has an attribute, which in the real world is referred to as the object's characteristics. For instance, in a company's employment database, the individual, department, and classification may all be considered entities. These entities possess certain traits that will serve as the relevant entity's attributes.
Direct connections between external entities and the database are not permitted. This is one of the data flow diagram design concepts to consider. What does this advice imply?
Draw an E-R diagram for the description below. Suppose that you are asked to model a database including all pharmaceutical companies, their drugs, and all pharmacies. Each pharmaceutical company is identified by its name and has a phone number. For each drug, the trade name (e.g., Acetaminophen) and formula must be recorded. Each drug is sold by only one pharmaceutical company, and the trade name identifies a drug uniquely from among the products of that company. If a pharmaceutical company stops production, we do not need to keep track of its products any longer. Each pharmacy has an identifier name, address, and phone number. Each pharmacy sells several drugs. A drug could be sold at several pharmacies, and the price could vary from one pharmacy to another.
Design and draw an ER diagram that captures the information about the university. Consider thefollowing information about a university database: Professors have an SSN, a name, an age, a rank,and a research specialty. Projects have a project number, a sponsor name (e.g., NSF), a startingdate, an ending date, and a budget. Graduate students have an SSN, a name, an age, and a degreeprogram (e.g., M.S. or Ph.D.). Each project is managed by one professor (known as the project’sprincipal investigator). Each project is worked on by one or more professors (known as theproject’s co-investigators). Professors can manage and/or work on multiple projects. Each projectis worked on by one or more graduate students (known as the project’s research assistants). Whengraduate students work on a project, a professor must supervise their work on the project.Graduate students can work on multiple projects, in which case they will have a (potentiallydifferent) supervisor for each one. Departments have a…
An attribute is a characteristic or a resource of an entity. To identify a person who maintains medical, student, and fitness club data in different database may the same qualities be applied to an object? Is there a good reason or a bad reason?
Create an ER diagram that correctly describes the database for exams at Campus in Bäcksvängen in accordance with the following description: (Own assumptions must be clearly described.) Staff for various functions are involved in the exams. All staff have a full name and a unique staff code. Some people are examiners on one or more courses. A course has one name and one unique ladok code. For a course, you can add up its points based on the associated elements. One part is part of a course (for example an exam, a laboratory or project). A course can have several different parts. An element has a name, a description, a torque code, one point and two or more grades (eg: U, G, VG). An element can only belong to one course. Since the database is to process the exams, it is obvious that a part like described as an examination has an examination opportunity that is identified, among other things, by the date, start time, end time and that it is possible to calculate total writing time. A…
How can one even begin to explain the scenery? When we say "perspective," what do we mean exactly? Does the information specified in a view definition ever genuinely exist in that form? What common results may be expected when a user interacts with a database through a view?