Exercise 3.1 Define the following terms: relation schema, relational database sch domain, attribute, attribute domain, relation instance, relation cardinality, and re
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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.Part 3 5. Database design often involves decisions about the storage of attributes. For example a Telephone Number can be stored as a one attribute or split into three attributes (one for each of the three hyphen-delineated groups of numbers in a Telephone Number (XXX)-XXX-XXXX, I.e (123)-456-7890). However, Telephone Number is usually stored in one attribute. The decision is usually based on how the database will be used. This exercise asks you to think about specific situations where dividing the Telephone Number is useful. List and describe the different situations, give examples.Create a conceptual schema for the following database domain. To make it completely clear, only one (the final) conceptual schema is expected. A book is described by ISBN and a title. ISBN uniquely identifies each book. A book consists of many chapters. A chapter is described by a chapter number, title and topic. Each chapter has a unique number within a book. A chapter belongs to one book only. A book is written by one or more authors. An author can write one or more books. An author is described by the first name, last name, date of birth, and country the author comes from. A triple of values: (first name, last name and date of birth) uniquely identifies each author. We have three types of books: textbooks, fiction books and biographies. A textbook is additionally described by the titles of course it has been applied to. A textbook can be applied to none or more courses. i need answer with diagram
- DATABASE SYSTEM A relation R is given which is R(A,B,C,D,E). It has the following functional dependencies: BC -> ADE , D -> B. Answer the following based on this information. Which normal forms does this relation satisfy? Which type of dependencies does this relation violate? Normalize the relationship so that it decomposes to 3NF.Q4: Design a database for an airline. The database must keep track of customers and their reservations, flights and their status, seat assignments on individual flights, and the schedule and routing of future flights. Your design should include a set of relational schemas, and a list of constraints, including primary-key and foreign-key constraints. Please note that an E-R diagram is not required.Relational Model (Logical and Physical Schema Development) The conceptual model developed in phase 2 will be transformed into a logical and physical schema using the relational data model. The outcome of this transformation will be a relational schema. The schema should have the following components: Set of required relations All the integrity constraints Submission and Evaluation: A report consisting of the problem statement, ER diagram, relational schema And implement the database using SQL should include: All the tables properly defined /created All constraints properly defined For each table, few instances of data should be entered. Producer Pharmacy medicines The pharmacy contains employees, certain medicines customers and patients Date Name Customers age pharmacy sex employees Commercial Record Address Location Salary Name
- 32. In a relational model, relations are termed as a. Tuples b. Attributes c. Rows d. TablesComputer Science Design an OO schema for a database application that you are interested in.Construct an EER schema for the application, and then create the corresponding classes in ODL. Specify a number of methods for each class, andthen specify queries in OQL for your database application.Relations describe the intersection between two axes, x and y. For example, a table (tuple) found in a database contains columns (attributes) and rows (records or observations). Database and Geospatial Mapping Application developers rely on tables and cartesian coordinate systems to adhere to the rules of relational database theory so that integrity in the location is preserved. Tables should only contain records that relate to the columns found in that table and the data domain determines what records should be stored in a given table. Database administrators can check for integrity in relationships within and between tables using structured query language (SQL). What other computer-science or IT jobs rely on relations?
- Subject - Fundamentals to Database Question 4 An entity-relationship diagram (ERD) is a specialized graphic that illustrates the relationships between entities in a database. ERD often use symbols to represent three different types of information. Draw the ERD for the following scenario: (a) Each lecturer is identified by a uniqie number, name and phone. A lecturer teaches several courses and for each course there us a unique code and title. There might be several be several lecturers in a course. (b) A university where a student may take many courses employs lecturer. Each lecturer teach one or more course but no course is taught by more than one lecturer. Each student has to complete two or three assignments for each course. (c) A car rent company wishes to create a database about its activities. The company has a number of vehicles. Each vehicle is of certain model. A customer can rent only one vehicle at a time. Every vehicle must be checked by an employee to make sure it is in…Problem 2: A database for maintaining information about the cities in the United States has the following relation schema Info(city_name, state, governor, mayor) The city_name attribute is the name of a city, state is the abbreviation for state the city is in, governor is the name of the governor of the state the city is in, and mayor is the name of the mayor of the city. For example, the tuple ('New York', 'NY', 'Andrew Cuomo', 'Bill de Blasio') gives information about New York City. Two cities may have the same name (for example there are at least two cities named Portland in the US), but two cities in the same state cannot have the same name. Two states cannot have the same abbreviation. Each city has exactly one mayo and each state has exactly one governor. 1. Which of the following are super keys? Which are candidate keys? (There may be more than one): {city_name} {state} {city_name, state} {city_name, state, mayor} 2. If there are 1000 cities from NY state in a relation of this…Swing Jazz Club ERD Problem Follow the Simple Procedure for ERD diagramming to design an ERD using the following user provided information. Remember the ERD will eventually turn into the design for a database from a top down view. Make sure you resolve any many to many conflicts. Label an identifier or primary key and all pertinent attributes given. If an attribute is not readily apparent from the user information, then make one up that makes sense for the particular entity. Therefore, all entities should end up with at least an identifier and another attribute that makes sense. You may use any of the approaches shown by the book, though the ER-Model and Crow’s foot are the most common. Make sure you show entities, relationships, cardinality, and optionality. Swing Jazz Club The Swing Jazz Club teaches swing and jazz dancing and offers both private and group lessons. Swing Jazz charges $60 dollars per hour for a private lesson and $10 dollars per hour for a group lesson.…