Write the short answers for the given question. Answer in 3-5 line maximum. A. Give examples of systems in which it may make sense to use traditional file processing instead of a database approach. Why? B. Why do we need mappings among schema levels? How do different schema definition languages support this architecture? C. Under what conditions can an attribute of a binary relationship type be migrated to become an attribute of one of the participating entity types?

Write the short answers for the given question. Answer in 3-5 line maximum. A. Give examples of systems in which it may make sense to use traditional file processing instead of a database approach. Why? B. Why do we need mappings among schema levels? How do different schema definition languages support this architecture? C. Under what conditions can an attribute of a binary relationship type be migrated to become an attribute of one of the participating entity types?

Database Systems: Design, Implementation, & Management

11th Edition

ISBN:9781285196145

Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Publisher:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Chapter10: Transaction Management And Concurrency Control

Section: Chapter Questions

Problem 1P

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Using a graphics program, develop an entity-relationship diagram for a database application for an Internet bookstore where students buy textbooks from a salesperson and receive invoices for their purchases. Use Figure 5.5 as a guide.
Write the short answers for the given question. Answer in 3-5 line maximuт. A. Give examples of systems in which it may make sense to use traditional file processing instead of a database approach. Why? B. Why do we need mappings among schema levels? How do different schema definition languages support this architecture? C. Under what conditions can an attribute of a binary relationship type be migrated to become an attribute of one of the participating entity types? D. List any 2 cases where the use of a null value would be appropriate.
Produce a relational schema diagram that corresponds to the linked ER diagram for a database for the television show Saturday Night Live (SNL). Your relational schema diagram should include primary and foreign keys. Often-times in database system development, requirements will change after the conceptual data model has been drafted: in your rela- tional schema diagram, add the following three additional attributes: attribute “birth.date" for the relation schema Host; attribute “start.date" for the relation schema Writer; and attribute “salary" for relation schema Cast Member. Please refer back to the requirements in Question 6, for additional details that may constrain the design of the relational schema model. Use the tool linked to create an image. Hints: please carefully note that "rerun date", “address", and “phone" are multi-valued attributes; how would those be depicted in the relational schema diagram? Also, please carefully note the many-to-many relationships; how would those…
Should the cardinality between entities be translated/read from both ends of the notation when dealing with database entity relationship modelling? In other words, should a relationship between things be understandable when read both forwards and backwards?
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.
Develop an EER model for the following situation using the traditional EER notation, the Visio notation, or the subtypes inside supertypes notation, as specified by your instructor: An international school of technology has hired you to create a database management system to assist in scheduling classes. After several interviews with the president, you have come up with the following list of entities, attributes, and initial business rules: • Room is identified by Building ID and Room No and also has a Capacity. A room can be either a lab or a classroom. If it is a classroom, it has an additional attribute called Board Type. • Media is identified by MType ID and has attributes of Media Type and Type Description. Note: Here we are tracking type of media (such as a VCR, projector, etc.), not the individual piece of equipment. Tracking of equipment is outside the scope of this project. • Computer is identified by CType ID and has attributes Computer Type, Type Description,…
Produce an entity relationship diagram for a relational database that will be able to address the case study. It is your task to design a database that will adhere to good design principles.
Show clearly all working explaining detailly each step
A relational database cannot facilitate many-to-many relationships due to its inherent design, which is based on the concept of tables with rows and columns. This design limits the ability to represent complex relationships between entities. For instance, if we consider a scenario where a student can enrol in multiple courses, and a course can have multiple students, a relational database cannot directly represent this many-to-many relationship. Instead, a workaround is required, such as creating a third table to act as a bridge between the two tables, which can be time-consuming and complex to manage.
Should the cardinality between entities be translated/read from both ends of the notation when dealing with database entity relationship modeling? To put it another way, can a connection between two things be comprehended by reading it both forward and backward?
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.

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