Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Chapter 1, Problem 3RQ
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Entity
- Entity is the basic block for building the data collected about person, place, event, or thing.
- Entities represent attributes that can have multiple instances.
- For example: STUDENT, EMPLOYEE.
Attribute:
- Attribute is a property or characteristics of a DBMS (
Database Management Systems). - It refers to the components of the database. Database tables or database fields are referred to as attributes.
- The instance in a particular row of a database is described by attributes...
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Task 1: ER diagram for give scenario
Consider building a database for a shopping mall with requirements as follows:
Each product of the shopping mall has a unique project No, and also has a name, a supplier name, a category, a purchase price and a selling price.
Products need to be supplied from suppliers. Each product has one supplier, but a supplier may supply many products for the shopping mall.
Each supplier has a supplier name and address.
A purchase order for product from a supplier has a unique order No, and a date. The order specifies one or more products and their quantities required for a product.
A sales order for product to customers has a unique order No, and a date. The order specifies one or more products and their quantities required for a product
The shopping mall has warehouses. Each warehouse has a warehouse number, an address and a contact phone number. Each warehouse has shelves to store products. Each shelf has a shelf-number and a capacity. The shelf…
In the database, what is the difference between attributes and entity. This can be clarified by a form in which everything is shown. For example, this is an arrow to what it refers to, and this is a circle to what it indicates.
Thank you
Draw ER (or EER) diagram: A conceptual database design for a chain of furniture stores is needed. The following is a summary of the database requirements:
a) The chain has many different stores in various cities and states. Each STORE has unique StoreNumber, plus an Address(made up of Street, City, State, ZipCode), and a StoreManager (who is an employee). Each store is organized into a number of departments.
b) Each DEPARTMENT contains certain types of furniture (such as ‘dining’, ‘living room’, ‘bedroom’, ‘office’, etc.), and has a DeptName that is unique within each store; it also has a DeptManager (who is an employee), and a number of SalesPersons (who are employees).
c) The company employs many employees. Each EMPLOYEE has a unique SSN, plus a Name (made up of FirstName, Minit, LastName), a job (e.g. ‘store manager’, ‘dept manager’, ‘sales associate’, ‘sales person’, etc.), plus DateOfBirth, Sex, Salary, and CommissionRate. Each employee works for a particular store.
Design an ER…
Chapter 1 Solutions
Oracle 12c: SQL
Ch. 1 - Prob. 1RQCh. 1 - Prob. 2RQCh. 1 - Prob. 3RQCh. 1 - Prob. 4RQCh. 1 - Discuss the problems that can be caused by data...Ch. 1 - Explain the role of a primary key.Ch. 1 - Prob. 7RQCh. 1 - Prob. 8RQCh. 1 - What type of relationship can’t be stored in a...Ch. 1 - Identify at least three reasons an organization...
Ch. 1 - Prob. 1MCCh. 1 - Prob. 2MCCh. 1 - Prob. 3MCCh. 1 - Prob. 4MCCh. 1 - Prob. 5MCCh. 1 - Prob. 6MCCh. 1 - Prob. 7MCCh. 1 - Which of the following has no partial or...Ch. 1 - Prob. 9MCCh. 1 - Which of the following has no partial dependencies...Ch. 1 - Which of the following has no repeating groups but...Ch. 1 - Prob. 12MCCh. 1 - Prob. 13MCCh. 1 - A unique identifier for a data row that consists...Ch. 1 - Which of the following symbols represents an...Ch. 1 - Prob. 16MCCh. 1 - Which of the following represents a field in a...Ch. 1 - Which of the following defines a relationship in...Ch. 1 - When part of the data in a table depends on a...Ch. 1 - Which of the following is used to join data...Ch. 1 - Which tables and fields would you access to...Ch. 1 - Prob. 2HOACh. 1 - Prob. 3HOACh. 1 - Prob. 4HOACh. 1 - Access path A database table is composed of...Ch. 1 - Prob. 6HOACh. 1 - Prob. 7HOACh. 1 - Prob. 8HOACh. 1 - Prob. 9HOACh. 1 - Prob. 10HOA
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- Consider the E-R diagram for a university database as shown in Figure 1. Which ones are super keys for course?(a) course id(b) course id, title(c) course id, title, credits(d) course id, creditsarrow_forwardDesign a database for an airline. The database must keep track of customers and theirreservations, flights and their status, seat assignments on individual flights, and the scheduleand routing of future flights. Your design should include an E-R diagram, a set of relationalschemas, and a list of constraints, including primary-key and foreign-key constraints.arrow_forwardDraw 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.arrow_forward
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