You have an application domain that consists of Cities, Towns, and Neighborhoods. A City has a name, zip code, state, and a country. A Town has a name, zip code, state, and country. A Neighborhood has a name, coordinate, and population. Using a relational model, what are Students, Courses, and Sections called? Select one:
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You have an application domain that consists of Cities, Towns, and Neighborhoods. A City has a name, zip code, state, and a country. A Town has a name, zip code, state, and country. A Neighborhood has a name, coordinate, and population. Using a relational model, what are Students, Courses, and Sections called?
Attributes
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Relations
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- You are working with a database that stores information about suppliers, parts and projects. The Supply relation records instances of a Supplier supplying a Part for a Project.The schema for the database used in this question is as follows: (note that primary keys are shown underlined, foreign keys in bold).SUPPLIER (SNo, SupplierName, City)PART (PNo, PartName, Weight)PROJECT (JobNo, JobName, StartYear, Country)SUPPLY (SNo, PNo, JobNo, Quantity)Provide relational algebra (NOT SQL) queries to find the following information. Each question is worth 2 marks.NOTE:• You can use the symbols etc or the words ‘PROJECT’, ‘RESTRICT’ etc as you prefer. • You do not need to try to make efficient queries – just correct ones. • Where you use a join, always show the join condition.a. List the quantity of parts supplied on JobNo 4745.b. List the weight of the Part named “Left-handed screwdriver”.c. List the Project name and Part name of any Parts where fewer than 500 of the part has been supplied to a…You are working with a database that stores information about suppliers, parts and projects. The Supply relation records instances of a Supplier supplying a Part for a Project.The schema for the database used in this question is as follows: (note that primary keys are shown underlined, foreign keys in bold). SUPPLIER (SNo, SupplierName, City)PART (PNo, PartName, Weight)PROJECT (JobNo, JobName, StartYear, Country)SUPPLY (SNo, PNo, JobNo, Quantity) Provide relational algebra (NOT SQL) queries to find the following information. NOTE:• You can use the symbols σ, π, etc or the words ‘PROJECT’, ‘RESTRICT’ etc as you prefer. • You do not need to try to make efficient queries – just correct ones. • Where you use a join, always show the join condition.a. List the quantity of parts supplied on JobNo 4745.b. List the weight of the Part named “Left-handed screwdriver”.c. List the Project name and Part name of any Parts where fewer than 500 of the part has been supplied to a particular project.d.…You are working with a database that stores information about suppliers, parts and projects. The Supply relation records instances of a Supplier supplying a Part for a Project.The schema for the database used in this question is as follows: (note that primary keys are shown underlined, foreign keys in bold). SUPPLIER (SNo, SupplierName, City)PART (PNo, PartName, Weight)PROJECT (JobNo, JobName, StartYear, Country)SUPPLY (SNo, PNo, JobNo, Quantity) Provide relational algebra (NOT SQL) queries to find the following information.NOTE:• You can use the symbols σ, π, etc or the words ‘PROJECT’, ‘RESTRICT’ etc as you prefer.• You do not need to try to make efficient queries – just correct ones.• Where you use a join, always show the join condition.a. List the Project name and Part name of any Parts where fewer than 500 of the part has been supplied to a particular project.b. List the name of any Suppliers who have supplied Parts to the Project called “New Academic Building” or to the Project…
- Which one is the key data model in SQLite? ( ) ER model. ( ) Network data model. ( ) Object-oriented data model. ( ) Relational data model. A DBMS contains components such as ________. ( ) Query processor, DDL compiler, and database manager ( ) DML preprocessor, system buffers, and file manager ( ) Application programs, ER diagram wrapper, catalog manager ( ) Database manager, dictionary manager, system access methods Which one of the following statements is wrong? ( ) Each relation and each attribute has a distinct name. ( ) More than one value is not allowed in each cell of relation. ( ) Once a relation schema is defined, the attributes are position order sensitive. ( ) The order of table rows really matters.Which of these is NOT a type of relationship in a relational database? a. two-to-one b. many-to-one c. many-to-many d. one-to-manyWhich of the following is a key part of conceptual design in an entity relationship model? This model resolves the many-to-many relationships to multiple one-to-many relationships. This model adds all of the attributes for each entity. This model converts attributes into columns. This model does not depend on the database management software or the hardware used to implement the model.
- Which database structure doesn't allow for a relationship between entities that has multiple nodes? The model's advantages and disadvantages are discussed.Giving the following schema for a supermarket database, specify the domain constrains for each attribute. CUSTOMERS (CustomerID , First_Name, Last_Name) EMPLOYEES (EmployeeID, Name, Email, PhoneNo) INVOICES( InvoiceID, Amount_Paid, Invoice_Date)mapping erd to relational schema Do it like picture please In Rectangles This is a data: I need draw making for this making schema please a)Mapping ERD to Relational Schema : Employee (empNo, ename, hiredate, DOB, phoneNo, gender, salary, commission, position, grade) Transaction (transactiondate, empNo, username, position) Login (ID, password) Grade (grade, salaryRange) Position (position, allowance) Allowance (allowance, allowanceDescription) Vehicle (empNo, make, model, nextMaintenance) Project (projectNo, projectName) Department (deptNo, deptName, deptDescription, totalEmpNo) Employee_Project (empNo, projectNo) Explanation: To map the ERD (Entity Relationship Diagram) to a relational schema, we need to identify the entities, relationships, and attributes in the diagram and convert them to tables, columns, and relationships in a relational database. Here is the relational schema for the entities provided: Employee (empno PK, ename, hiredate, DOB, PhoneNo, gender,…
- Given the following relational schema (Hint: the bold text represents a primary key), Professor(emp_num, emp_fname, emp_lname, emp_dob, dept_code, prof_ext)Class (class_code, course_code, class_section, class_time, class_room, emp_num)Course (course_code, course_name, crs_credits, dept_code) Write a relation algebra to find all "Database Design and Implementation" classes including section, time, room, and professor name (first name and last name). Hint: "Database Design and Implementation" is the course nameConsider the following relations for a simple airport databas Hangars (hangNo, capacity, location, status) AirplaneTypes (Model, capacity, weight) Airplanes (regNo, model, hangNO) Owners (owner, name, address, phone, ssn) Owns (regNo, ownID, startedDate) There are four foreign keys for this database: 1. The attribute hangNo of the relation Airplanes that references the relation Hangars, 2. The attribute model of the relation Airplanes that references the relation AirplaneTypes, 3. The attribute regNo of the relation Owns that references the relation Airplanes, and 4. The attribute ownID of the relation Owns that references the relation Owner. Q1: Write SQL statements to define the above relation Hangars. You should choose a suitable data type and/or daya size for each column and be sure to declare appropriate integrity constraint(s). Q2. Which of the following SQL statements is used to define the above relation Airplanes? Ensure the data type and size for each attribute are…Given the following relational schema of a database library (primary keys are underlined and foreign keys are preceded by #): Student(studentNumber, StudentName, studentAddress) Book(bookNumber, bookTitle, #authorNumber, #editorNumber, yearEdition) Author(authorNumber, authorName, authorAddress) Editor(editorNumber, editorName, editorAddress) Borrow(#studentNumber, #bookNumber, borrowDate, returnDate) Write the following queries in Relational Algebra: Find the details of students who borrowed the book titled ‘Database Management Systems’
