Imagine a database that stores records of what students are enrolled in what class, and what teachers are teaching those class. Just in words, Give an example of one to one relationship in the context of a student class database.
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- 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.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.You are required to design and implement a database system for a pharmacy shop with only one branch. The following is the description from the manager, Mr. Seth Akoto. “here, medicines that require prescriptions are sold only to people that have prescriptions. It is the pharmacy attendant that serves customers when they enter the pharmacy. Usually, people walk in and either give the prescription or mention the medicine they wish to purchase. The worker then searches to see if the medicine is in stock. If in stock, worker accepts payment from customer and gives the medicine and a receipt to the customer. “ 1. Determine all the entities from the description given by Mr. Akoto. 2. Assuming Mr. Akoto only wants a database system that would keep records of medicine{name of medicine, amount in grams in stock} and purchases{medicine bought, amount in grams bought, who attended to customer, when it was sold, contact and name of customer that bought the medicine} a. Draw and ER diagram with…
- Suppose we have a database for an university. The requirements are as follows: • 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 starting date, an ending date, and a budget. • Graduate students have an SSN, a name, an age, and a degree program (e.g., M.S. or Ph.D.). • Each project is managed by one professor (known as the project’s principal investigator). • Each project is worked on by one or more professors (known as the project’s co-investigators). • Professors can manage and/or work on multiple projects. • Each project is worked on by one or more graduate students (known as the project’s research assistants). • When graduate 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 (potentially different) supervisor for each one. The FDs for the above requirements are given as, • PSSN →…Consider the situation when two students are interested in enrolling in the same class but there is only space for one additional. Why can't they both just get the final seat in the car if there's a database system blocking it?A bank provides services to customers. The banks is identified by its code and has a name and an address. The bank has several branches. A branch is identified by its code that is unique for a given bank. The branch name and address are also stored in the database. Customers deal with the bank through the bank branches. So, a customer belongs to a specific bank branch. Customers either open bank accounts (CURRENT, SAVINGS, etc.) or receive bank loans (DIRECT, INDIRECT, etc.) from the bank. The bank stores customer info namely: EID, name, phone, and address. The bank also keeps track of customers’ loans and accounts. Information stored about loans include loan no, amount, and type. Account information stored is account no, balance, and type. The address information stored for any entity includes street number, street name, PO Box, city, and emirate. Draw an ER diagram representing the needed database.
- A database has been designed to display a list of popular movies and also a list of actors acting in these movies. The relationship that would exist between the related tables would be: O many to many one to many O many to one O one to oneDraw an ER model; An author writed a book . Every book has a title, ISBN, year, and price. each book may be authored by one or more author and each author may write one , or more than one book. For authors the database keeps the name, address and URL of their homepage. Each book has a publisher. The database keeps the name, address , and phone number adn the URL of their wedbsite. Each publishers publishes one or more books and each book is published by exactly one publisher. The warehouse stocks several books. Each warehouse has a code, address and phone number. The database records the number of copies stocked at various warehouse.ASSESSMENT 02 1. You are required to design and implement a database system for a pharmacy shop with only one branch. The following is the description from the manager, Mr. Seth Akoto. "here, medicines that require prescriptions are sold only to people that have prescriptions. It is the pharmacy attendant that serves customers when they enter the pharmacy. Usually, people walk in and either give the prescription or mention the medicine they wish to purchase. The worker then searches to see if the medicine is in stock. If in stock, worker accepts payment from customer and gives the medicine and a receipt to the customer.“ 1. Determine all the entities from the description given by Mr. Akoto. 2. Assuming Mr. Akoto only wants a database system that would keep records of medicine{name of medicine, amount in grams in stock} and purchases{medicine bought, amount in grams bought, who attended to customer, when it was sold, contact and name of customer that bought the medicine} a. Draw and ER…
- You have been assign to design a database for Apartment Rental Management System. That is the information you received: Everything starts with an offer of apartments for rent. It is therefore necessary to identify all the buildings held by the company, as well as all the apartments within each of these buildings. We distinguish the building by its address and each of the apartments by its apartment number in the building. When a tenant is accepted, a lease is signed (only one tenant can sign the lease), which determines the amount of the monthly rent, as well as the start and end date of the tenancy. When advertising the apartments, the rent requested is also indicated. The tenants choose an apartment according to the number of rooms and according to the services included, which can be the same from one apartment to another. In order to satisfy the banker, the value of the buildings and their year of construction are preserved, making it possible to compare the rents demanded with the…Consider a straightforward database that contains data about a student's grades. Provide a SQL query that will return a list of the honour roll students (the top 10%), ordered by their grade point average, and design how this database may appear.Take, for example, a database for an airline, where the database system makes use of snapshot isolation. A nonserializable execution may occur, but the airline may be ready to tolerate it in order to get better overall performance.