Each of the database models should have one benefit and one downside, so list them all.
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- just answer true/false. a] There are three main components of ER model which are an entity, an attribute and a relationship. b] Composite attributes are attributes that can have many values. c] Database programming languages receive all application requests and translate them into the complex operations required to fulfill those requests.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.Suppose you are asked to design a club database system based on the following information. Each student has a unique student id, a name, and an email; each club has a unique club id, a name, a contact telephone number, and has exactly one student as its president. Each student can serve as a president in at most one of the clubs, although he/she can be the members of several clubs. Clubs organize activities and students can participate in any of them. Each activity is described by a unique activity id, a place, a date, a time and those clubs that organize it. If an activity is organized by more than one club, different clubs might contribute different activity fees.QuestionDraw an E-R diagram for the system according to the above description.
- 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?Please give a step-by-step answer. The ER Diagram must contain the ER-Diagram Symbols. Design an EER diagram for a Hospital Management System. The hospital wants to keep track of all their doctors, nurses, other staff, wards, patients and appointments. They have hired you to help them design the database for that purpose. You can design your EER as you wish, but it must satisfy the following constraints: a) there should be at least one disjoint-total specialization/generalization. b) There should be at least five regular/strong entities [excluding subclasses] c) There must be a weak entity d) There must be at least one M:N relationship. e) There must be at least one derived attribute.An objective of this task is to denormalize a conceptual schema to speed up processing of a given class of applications. The following conceptual schema represents a database domain where the contract and permanent employees are assigned to the projects. (see image below) Requirements Steps Involved: - Elimination of generalization using Association, Subset or Superset method - Simplifications: •Elimination of association classes •Elimination of link attributes •Elimination of many-to-many associations Perform simplification of the conceptual schema above and re-draw the simplified conceptual schema.
- Draw an EER diagram for AIRLINE relational database. According to model, the following requirements are satisfied:The AIRLINE relational database schema shown in the above figure describes a database for airlineflight information. Each FLIGHT is identified by a Flight_number, and consists of one or moreFLIGHT_LEGs with Leg_numbers 1, 2, 3, and so on. Each FLIGHT_LEG has scheduled arrival anddeparture times, airports, and one or more LEG_INSTANCEs—one for each Date on which the flighttravels. FAREs are kept for each FLIGHT. For each FLIGHT_LEG instance, SEAT_RESERVATIONs are kept,as are the AIRPLANE used on the leg and the actual arrival and departure times and airports. AnAIRPLANE is identified by an Airplane_id and is of a particular AIRPLANE_TYPE. CAN_LAND relatesAIRPLANE_TYPEs to the AIRPORTs at which they can land. An AIRPORT is identified by an Airport_code.1. Draw an E/R diagram for a University database. This database should contain information about the university's students, departments, professors, teaching assistants (also students of the university), courses offered by a department, which students are enrolled in what courses, which professors are teaching which courses, student letter grades. You may include any other information deemed appropriate. • Some restrictions apply as listed below| 1. A Professor only works in at most one department. 2. Students and professors have been assigned unique email id's 3. A course is only taught by one professor and offered by one department. 4. A course is uniquely identified by the course number, section number and semester. Example: CSCE520-001 Spring21 5. A course has at most one TA.Please read the instructions carefully;1. Find a domain to design your database. Examples: University database, Flightreservation system, etc. Note: Please do not use these. As discussed in the class, try tochoose a domain which is not explored much / your own family business.2. Collect the necessary information to model the database for the chosen domain.3. Identify entity sets, relationship sets, attributes etc.4. Draw the ER diagram5. Reduce the ERD into conceptual schema by applying appropriate rules.6. Normalize each schema upto BCNF
- Kindly go through this. The database development starts with the requirements analysis. There are many sources for gathering requirements. One of the important sources for requirements is “user interview”. During these interviews, users are asked about what kind of a system they need. Then requirements gathered from the interviews are transformed into a data model. Assume that a database designer made an interview and created an E-R diagram as above. Write a scenario that the user described requirements as in the Library Management System case study in Chapter 3.3 of Sharma et al. (2010, p. 77) during the interview - 3.3 A case study involving a Library Management System - This case study describes a simple Library Management System. Assume the requirements for the system were written by your client exactly in these terms:"The system will manage author's and loaner's information, and keep track of books loaned. The borrower's information includes name, address, e-mail, and phone. The…Draw an ER diagram for the given scenario; Suppose that you are designing a schema to record information about reality shows on TV. Your database needs to record the following information: _ For each reality show, its name, genre, basic_info and participants name. Any reality show has at least two or more participants. _ For each producer, the company name, company country. A show is produced by exactly one producer. And one producer produces exactly one show. _ For each television, its name, start year, head office. A television may broadcast multiple shows. Each show is broadcasted by exactly one television. _ For each user, his/her username, password, and age. A user may rate multiple shows, and a show may be rated by multiple users. Each rating has a score of 0 to 10.Design a relational database schema from the Car Sharing IS domain class diagram. Output should look like image number 2