The term "dependent entity" refers to an entity whose existence is contingent upon that of another entity.
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Q: School system scenario Students come at the beginning of the school year to register in a school…
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Q: ENHANCE ENTITY RELATIOSHIP DIAGRAM The entity type PERSON has the following attributes: SSN, name,…
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Q: What exactly is an entity?
A: Answer : Entity : An entity is something which exists as a subject or an object .
The term "dependent entity" refers to an entity whose existence is contingent upon that of another entity.
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- School system scenario Students come at the beginning of the school year to register in a school system and pay for the year’s fees..Each student is added to the appropriate class . each class has several teachers already registered in the system, tests are made by the teachers and the teacher adds the students' grades in the system, and at the end of the year the system issues students ’certificates. draw Entity Relationship diagram(ERD) from above scenarioDescribe the characteristics of an associative entity.An attribute is a property that describes the nature of an entity.
- Entity-Relationship Diagrams (ERD) Background Information: Study the following statements to determine the relationship between the entities • Each student has an academic advisor. An academic advisor can advise many students. • Each academic advisor has a specific parking spot assigned. • Each student can take up to five courses. and each course has up to 24 students. • Several adjunct faculty members share an office. Tasks: 1. Draw an ERD (it is just one diagram) showing the entities and the relationships among them. Include associative entities, if any. Also, remember to show cardinality (1:1, 1:M, M:N); you can use the cardinality notation or the crow’s foot notation. Remember that this is a graphical language, and you must follow the shapes of the elements in the diagram.An attribute is a descriptive property of an entity.An Entity Relationship (ER) Diagram is a type of flowchart that illustrates how “entities” such as people, objects or concepts relate to each other within a system. Consider the following description of a system: A university registrar’s office maintains data about following entities: Courses, including number, title, credits, syllabus, and prerequisites. Course offerings, including course number, year, semester, section number, instructor, timings and classroom. Students, including student-id, name, and program. Instructors, including identification number, name, department, and title. Furthermore, the enrollment of students in courses and grades awarded to students in each course they are enrolled for must be appropriately modeled. Construct an ER Diagram for the registrar’s office. Document all assumptions that you make about the mapping constraints.
- Creating a new entity is an example of which level of abstraction: (a)Conceptual (b)Internal (c)External (d)None of the aboveENHANCE ENTITY RELATIOSHIP DIAGRAM The entity type PERSON has the following attributes: SSN, name, address (City/State/Zip), date of birth, age, and contact number. The entity also has the three subtypes: CAMPER, BIKER, AND RUNNER. Draw a separate diagram segment for each of the following situations: 1. At a given time, a person must be exactly one of three subtypes. 2. A person may or may not be one of these subtypes. However, a person who is one of these subtypes cannot at the same time be one of the other subtypes. 3. A person may or may not be the one of these subtypes. On the other hand, a person may be any two (or even three) of these subtypes at the same time. 4. At a given time, a person must be at least one of these subtypes.Please describe what an entity-relationship model is as well as how it operates.
- TRUE or FALSE - Generalization (is-a) is the relationship established between entities to show that sub-entities that are derived from the generalized entity. Select one: a. TRUE b.FALSEWhat is the definition of an entity? a person or thing that exists.develop an Entity Relationship Diagram for the application described in the following paragraph. Pick and Shovel Construction Company is a multi-state building contractor specializing in medium-priced town homes. Assume that Pick and Shovel's main entities are its customers, employees, projects and equipment. A customer can hire the company for more than one project, and employees sometimes work on more than one project at a time. Equipment, however, is assigned to only one project at a time. Draw an ERD showing those entities.