# Exercise 1: Relational Model

Save this PDF as:

Size: px
Start display at page:

## Transcription

1 Exercise 1: Relational Model 1. Consider the relational database of next relational schema with 3 relations. What are the best possible primary keys in each relation? employ(person_name, street, city) works(person_name, company_name, salary) company(company_name, city) 2. Consider the foreign key constraint from the dept name attribute of instructor to the department relation. Give examples of inserts and deletes to these relations, which can cause a violation of the foreign key constraint. 3. Consider the time slot relation. Given that a particular time slot can meet more than once in a week, explain why day and start time are part of the primary key of this relation, while end time is not. 4. In the instance of instructor shown in next figure, no two instructors have the same name. From this, can we conclude that name can be used as a superkey (or primary key) of instructor? 5. What is the result of first performing the cross product of student and advisor, and then performing a selection operation on the result with the predicate s_id = ID? (Using the symbolic notation of relational algebra, this query can be written as.)

2 6. Consider the following expressions, which use the result of a relational algebra operation as the input to another operation. For each expression, explain in words what the expression does. 7. Consider the relational database of the following schema with 3 relations. Give an expression in the relational algebra to express each of the following queries: a. Find the names of all employees who live in city Miami. b. Find the names of all employees whose salary is greater than \$100,000. c. Find the names of all employees who live in Miami and whose salary is greater than \$100, Consider the following schema for a bank database. Give an expression in the relational algebra for each of the following queries: a. Find the names of all branches located in Chicago. b. Find the names of all borrowers who have a loan in branch Downtown.

4 3. Suppose that we have a relation marks(id, score) and we wish to assign grades to students based on the score as follows: grade F if score < 40, grade C if 40 score < 60, grade B if 60 score < 80, and grade A if 80 score. Create the relation marks and insert the some sample values. Write SQL queries to do the following: a. Display the grade for each student, based on the marks relation. b. Find the number of students with each grade. 4. The SQL like operator is case sensitive, but the lower() function on strings can be used to perform case insensitive matching. To show how, write a query that finds departments whose names contain the string sci as a substring, regardless of the case. 5. Consider the following insurance database schema, where the primary keys are underlined. Construct the following SQL queries for this relational database. a. Find the total number of people who owned cars that were involved in accidents in Consider the following bank database schema, where the primary keys are underlined. Construct the following SQL queries for this relational database.

5 a. Find all customers of the bank who have an account but not a loan. b. Find the names of all customers who live on the same street and in the same city as Smith. c. Find the names of all branches with customers who have an account in the bank and who live in city called Harrison. 7. Consider the following employee database schema, where the primary keys are underlined. Give an expression in SQL for each of the following queries. a. Find the names and cities of residence of all employees who work for First Bank Corporation. b. Find the names, street address, and cities of residence of all employees who work for First Bank Corporation and earn more than \$10,000. c. Find all employees in the database who do not work for First Bank Corporation. d. Find all employees in the database who earn more than each employee of Small Bank Corporation. e. Assume that the companies may be located in several cities. Find all companies located in every city in which Small Bank Corporation is located. f. Find the company that has the most employees. g. Find those companies whose employees earn a higher salary, on average, than the average salary at First Bank Corporation.

6 Exercise 2B: Simple SQL 1. Write the following inserts, deletes or updates in SQL, using the university schema. a. Increase the salary of each instructor in the Comp. Sci. department by 10%. b. Try to insert every student whose tot_cred attribute is greater than 100 as an instructor in the same department, with a salary of \$10,000. Explain what happens. What about having salary \$30,000? 2. Consider the following insurance database schema, where the primary keys are underlined. Construct the following SQL queries for this relational database. a. Add a new accident to the database; assume any values for required attributes. b. Delete the Mazda belonging to John Smith. 3. Consider the following relational database schema. Give an expression in SQL for each of the following queries. a. Modify the database so that Jones now lives in Newtown. b. Give all managers of First Bank Corporation a 10-percent raise unless the salary becomes greater than \$100,000; in such cases, give only a 3-percent raise.

7 1. Write the following queries in SQL: Exercise 3: Intermediate SQL a. Display a list of all instructors, showing their ID, name, and the number of sections that they have taught. Make sure to show the number of sections as 0 for instructors who have not taught any section. Your query should use an outerjoin, and should not use scalar subqueries. b. Write the same query as above, but using a scalar subquery, without outerjoin. c. Display the list of all course sections offered in Spring 2010, along with the names of the instructors teaching the section. If a section has more than one instructor, it should appear as many times in the result as it has instructors. If it does not have any instructor, it should still appear in the result with the instructor name set to. [Hint: use function coalesce(name, - )]; d. Display the list of all departments, with the total number of instructors in each department, without using scalar subqueries. Make sure to correctly handle departments with no instructors. 2. Show how to define the view student_grades (ID, GPA) giving the grade-point average of each student, based on the following query (used in Exercise 2A); recall that we used a relation grade_points(grade, points) to get the numeric points associated with a letter grade. 3. Complete the SQL DDL definition of the university database of the following schema to include the relations student, takes, advisor, and prereq. 4. Consider the relational database with the following schema. Give an SQL DDL definition of this database. Identify referential-integrity constraints that should hold, and include them in the DDL definition. 5. For the manages relation of the previous exercise, add a foreign-key clause to require that every manager also be an employee. Explain exactly what happens when a tuple in the relation employee is deleted.

8 Exercise4: ER Modeling 1. Construct an E-R diagram for a car insurance company whose customers own one or more cars each. Each car has associated with it zero to any number of recorded accidents. Each insurance policy covers one or more cars, and has one or more premium payments associated with it. Each payment is for a particular period of time, and has an associated due date, and the date when the payment was received. 2. Consider a database used to record the marks that students get in different exams of different course offerings (sections). Construct an E-R diagram that models exams as entities, and uses a ternary relationship, for the database. 3. Develop the E-R diagram for an online bookstore. Books are identified by ISBN codes, written by authors and sold at a given price. Books are published by publishers. The online bookstore has several warehouses with a given stock-level for each title, whereas each book may be present (at different quantities) in different warehouses. Customers create accounts (assume that user_id is their ) and in each session they make a shopping basket. 4. Consider in the following figure, the alternative representation of a ternary relationship (a) using binary relationships (b or c). a. Show a simple instance of E, A, B,C, RA, RB, and RC that cannot correspond to any instance of A, B,C, and R.

9 b. Modify the E-R diagram of Figure 7.27b to introduce constraints that will guarantee that any instance of E, A, B,C, RA, RB, and RC that satisfies the constraints will correspond to an instance of A, B,C, and R. 5. A weak entity set can always be made into a strong entity set by adding to its attributes the primary-key attributes of its identifying entity set. Outline what sort of redundancy will result if we do so. 6. The advisor relationship is one-to-many (see figure). Suppose the advisor relationship were oneto-one. What extra constraints are required on the relation advisor to ensure that the one-to-one cardinality constraint is enforced? 7. Consider a many-to-one relationship R between entity sets A and B. Suppose the relation created from R is combined with the relation created from A. In SQL, attributes participating in a foreign key constraint can be null. Explain how a constraint on total participation of A in R can be enforced using not null constraints in SQL. 8. The following figure shows a lattice structure of generalization and specialization (attributes not shown). For entity sets A, B, and C, explain how attributes are inherited from the higher-level entity sets X and Y. Discuss how to handle a case where an attribute of X has the same name as some attribute of Y. 9. Design a database for a world-wide package delivery company (e.g., DHL or FedEX). The database must be able to keep track of customers (who ship items) and customers (who receive items); some customers may do both. Each package must be identifiable and trackable, so the database must be able to store the location of the package and its history of locations. Locations include trucks, planes, airports, and warehouses. Your design should include an E-R diagram, a set of relational schemas, and a list of constraints, including primary-key and foreign-key constraints.

10 10. 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 an E-R diagram, a set of relational schemas, and a list of constraints, including primary-key and foreign-key constraints.

### Introduction to SQL C H A P T E R3. Exercises

C H A P T E R3 Introduction to SQL Exercises 3.1 Write the following queries in SQL, using the university schema. (We suggest you actually run these queries on a database, using the sample data that we

### Intermediate SQL C H A P T E R4. Practice Exercises. 4.1 Write the following queries in SQL:

C H A P T E R4 Intermediate SQL Practice Exercises 4.1 Write the following queries in SQL: a. Display a list of all instructors, showing their ID, name, and the number of sections that they have taught.

### Introduction to SQL (3.1-3.4)

CSL 451 Introduction to Database Systems Introduction to SQL (3.1-3.4) Department of Computer Science and Engineering Indian Institute of Technology Ropar Narayanan (CK) Chatapuram Krishnan! Summary Parts

### Database Design and the E-R Model

C H A P T E R 7 Database Design and the E-R Model Practice Exercises 7.1 Answer: The E-R diagram is shown in Figure 7.1. Payments are modeled as weak entities since they are related to a specific policy.

### Foundations of Information Management

Foundations of Information Management - WS 2012/13 - Juniorprofessor Alexander Markowetz Bonn Aachen International Center for Information Technology (B-IT) Data & Databases Data: Simple information Database:

### There are five fields or columns, with names and types as shown above.

3 THE RELATIONAL MODEL Exercise 3.1 Define the following terms: relation schema, relational database schema, domain, attribute, attribute domain, relation instance, relation cardinality, andrelation degree.

### Database Design. Marta Jakubowska-Sobczak IT/ADC based on slides prepared by Paula Figueiredo, IT/DB

Marta Jakubowska-Sobczak IT/ADC based on slides prepared by Paula Figueiredo, IT/DB Outline Database concepts Conceptual Design Logical Design Communicating with the RDBMS 2 Some concepts Database: an

### CPS352 Database Systems: Design Project

CPS352 Database Systems: Design Project Purpose: Due: To give you experience with designing and implementing a database to model a real domain Various milestones due as shown in the syllabus Requirements

### Outline. Data Modeling. Conceptual Design. ER Model Basics: Entities. ER Model Basics: Relationships. Ternary Relationships. Yanlei Diao UMass Amherst

Outline Data Modeling Yanlei Diao UMass Amherst v Conceptual Design: ER Model v Relational Model v Logical Design: from ER to Relational Slides Courtesy of R. Ramakrishnan and J. Gehrke 1 2 Conceptual

### Lecture 6. SQL, Logical DB Design

Lecture 6 SQL, Logical DB Design Relational Query Languages A major strength of the relational model: supports simple, powerful querying of data. Queries can be written intuitively, and the DBMS is responsible

### Entity Relationship Diagram

Yufei Tao Department of Computer Science and Engineering Chinese University of Hong Kong A primary goal of database design is to decide what tables to create. Usually, there are two principles: 1 Capture

### model license person owns car report-number participated damage-amount E-R diagram for a Car-insurance company.

Exercises 9 address model driver-id license person owns car report-number location date driver participated accident damage-amount Figure 2.1 E-R diagram for a Car-insurance company. Exercises 2.1 Explain

### Question 1. Relational Data Model [17 marks] Question 2. SQL and Relational Algebra [31 marks]

EXAMINATIONS 2005 MID-YEAR COMP 302 Database Systems Time allowed: Instructions: 3 Hours Answer all questions. Make sure that your answers are clear and to the point. Write your answers in the spaces provided.

### Foundations of Information Management

Foundations of Information Management - WS 2009/10 Juniorprofessor Alexander Markowetz Bonn Aachen International Center for Information Technology (B-IT) Alexander Markowetz Born 1976 in Brussels, Belgium

### Entity Relationship Model

C H A P T E R 2 Entity Relationship Model Exercises 2.2 Answer: See Figure 2.1 2.4 Answer: See Figure 2.2. In the answer given here, the main entity sets are,, -offering, and instructor. The entity set

### The Relational Model. Ramakrishnan&Gehrke, Chapter 3 CS4320 1

The Relational Model Ramakrishnan&Gehrke, Chapter 3 CS4320 1 Why Study the Relational Model? Most widely used model. Vendors: IBM, Informix, Microsoft, Oracle, Sybase, etc. Legacy systems in older models

### Chapter 2: Entity-Relationship Model. E-R R Diagrams

Chapter 2: Entity-Relationship Model What s the use of the E-R model? Entity Sets Relationship Sets Design Issues Mapping Constraints Keys E-R Diagram Extended E-R Features Design of an E-R Database Schema

### Lab Manual. Database Systems COT-313 & Database Management Systems Lab IT-216

Lab Manual Database Systems COT-313 & Database Management Systems Lab IT-216 Lab Instructions Several practicals / programs? Whether an experiment contains one or several practicals /programs One practical

### COMP 378 Database Systems Notes for Chapter 7 of Database System Concepts Database Design and the Entity-Relationship Model

COMP 378 Database Systems Notes for Chapter 7 of Database System Concepts Database Design and the Entity-Relationship Model The entity-relationship (E-R) model is a a data model in which information stored

### Figure 4.12.Insurancedatabase.

Exercises 43 person (driver-id, name, address) car (license, model, year) accident (report-number, date, location) owns (driver-id, license) participated (driver-id, car, report-number, damage-amount)

### ER modelling, Weak Entities, Class Hierarchies, Aggregation

CS344 Database Management Systems ER modelling, Weak Entities, Class Hierarchies, Aggregation Aug 2 nd - Lecture Notes (Summary) Submitted by - N. Vishnu Teja Saurabh Saxena 09010125 09010145 (Most the

### COMP 5138 Relational Database Management Systems. Week 5 : Basic SQL. Today s Agenda. Overview. Basic SQL Queries. Joins Queries

COMP 5138 Relational Database Management Systems Week 5 : Basic COMP5138 "Relational Database Managment Systems" J. Davis 2006 5-1 Today s Agenda Overview Basic Queries Joins Queries Aggregate Functions

### The Entity-Relationship Model

The Entity-Relationship Model 221 After completing this chapter, you should be able to explain the three phases of database design, Why are multiple phases useful? evaluate the significance of the Entity-Relationship

### EECS 647: Introduction to Database Systems

EECS 647: Introduction to Database Systems Instructor: Luke Huan Spring 2013 Administrative Take home background survey is due this coming Friday The grader of this course is Ms. Xiaoli Li and her email

### DATABASE INTRODUCTION

Introduction The history of database system research is one of exceptional productivity and startling economic impact. We have learnt that from the days of file-based systems there are better ways to handle

### Database Management Systems

Database Management Systems Database Design (1) 1 Topics Information Systems Life Cycle Data Base Design Logical Design Physical Design Entity Relationship (ER) Model Entity Relationship Attributes Cardinality

### 2. Conceptual Modeling using the Entity-Relationship Model

ECS-165A WQ 11 15 Contents 2. Conceptual Modeling using the Entity-Relationship Model Basic concepts: entities and entity types, attributes and keys, relationships and relationship types Entity-Relationship

### Chapter 2: Entity-Relationship Model. Entity Sets. " Example: specific person, company, event, plant

Chapter 2: Entity-Relationship Model! Entity Sets! Relationship Sets! Design Issues! Mapping Constraints! Keys! E-R Diagram! Extended E-R Features! Design of an E-R Database Schema! Reduction of an E-R

### Data Analysis 1. SET08104 Database Systems. Copyright @ Napier University

Data Analysis 1 SET08104 Database Systems Copyright @ Napier University Entity Relationship Modelling Overview Database Analysis Life Cycle Components of an Entity Relationship Diagram What is a relationship?

### The Relational Model. Why Study the Relational Model? Relational Database: Definitions. Chapter 3

The Relational Model Chapter 3 Database Management Systems 3ed, R. Ramakrishnan and J. Gehrke 1 Why Study the Relational Model? Most widely used model. Vendors: IBM, Informix, Microsoft, Oracle, Sybase,

### Data Modeling. Database Systems: The Complete Book Ch. 4.1-4.5, 7.1-7.4

Data Modeling Database Systems: The Complete Book Ch. 4.1-4.5, 7.1-7.4 Data Modeling Schema: The structure of the data Structured Data: Relational, XML-DTD, etc Unstructured Data: CSV, JSON But where does

### Introduction to Databases

Introduction to Databases IT University of Copenhagen January 7, 2005 This exam consists of 6 problems with a total of 16 questions. The weight of each problem is stated. You have 4 hours to answer all

### CS2Bh: Current Technologies. Introduction to XML and Relational Databases. The Relational Model. The relational model

CS2Bh: Current Technologies Introduction to XML and Relational Databases Spring 2005 The Relational Model CS2 Spring 2005 (LN6) 1 The relational model Proposed by Codd in 1970. It is the dominant data

### Lesson 8: Introduction to Databases E-R Data Modeling

Lesson 8: Introduction to Databases E-R Data Modeling Contents Introduction to Databases Abstraction, Schemas, and Views Data Models Database Management System (DBMS) Components Entity Relationship Data

### Databases Model the Real World. The Entity- Relationship Model. Conceptual Design. Steps in Database Design. ER Model Basics. ER Model Basics (Contd.

The Entity- Relationship Model R &G - Chapter 2 A relationship, I think, is like a shark, you know? It has to constantly move forward or it dies. And I think what we got on our hands is a dead shark. Woody

### Chapter 2: Entity-Relationship Model

Chapter 2: Entity-Relationship Model Entity Sets Relationship Sets Design Issues Mapping Constraints Keys E R Diagram Extended E-R Features Design of an E-R Database Schema Reduction of an E-R Schema to

### SUBQUERIES AND VIEWS. CS121: Introduction to Relational Database Systems Fall 2015 Lecture 6

SUBQUERIES AND VIEWS CS121: Introduction to Relational Database Systems Fall 2015 Lecture 6 String Comparisons and GROUP BY 2! Last time, introduced many advanced features of SQL, including GROUP BY! Recall:

### Relationele Databases 2002/2003

1 Relationele Databases 2002/2003 Hoorcollege 7 12 juni 2003 Jaap Kamps & Maarten de Rijke April Juli 2003 Praktische dingen 6.2 6.3 6.5 6.7 Plan voor Vandaag Theorie Silberschatz et al: hoofdstuk 7 (

### The Relational Model. Why Study the Relational Model? Relational Database: Definitions

The Relational Model Database Management Systems, R. Ramakrishnan and J. Gehrke 1 Why Study the Relational Model? Most widely used model. Vendors: IBM, Microsoft, Oracle, Sybase, etc. Legacy systems in

### www.gr8ambitionz.com

Data Base Management Systems (DBMS) Study Material (Objective Type questions with Answers) Shared by Akhil Arora Powered by www. your A to Z competitive exam guide Database Objective type questions Q.1

### Unit 2.1. Data Analysis 1 - V2.0 1. Data Analysis 1. Dr Gordon Russell, Copyright @ Napier University

Data Analysis 1 Unit 2.1 Data Analysis 1 - V2.0 1 Entity Relationship Modelling Overview Database Analysis Life Cycle Components of an Entity Relationship Diagram What is a relationship? Entities, attributes,

### Converting E-R Diagrams to Relational Model. Winter 2006-2007 Lecture 17

Converting E-R Diagrams to Relational Model Winter 2006-2007 Lecture 17 E-R Diagrams Need to convert E-R model diagrams to an implementation schema Easy to map E-R diagrams to relational model, and then

### CSC 742 Database Management Systems

CSC 742 Database Management Systems Topic #4: Data Modeling Spring 2002 CSC 742: DBMS by Dr. Peng Ning 1 Phases of Database Design Requirement Collection/Analysis Functional Requirements Functional Analysis

### The Relational Model. Why Study the Relational Model?

The Relational Model Chapter 3 Instructor: Vladimir Zadorozhny vladimir@sis.pitt.edu Information Science Program School of Information Sciences, University of Pittsburgh 1 Why Study the Relational Model?

### Database Design Overview. Conceptual Design ER Model. Entities and Entity Sets. Entity Set Representation. Keys

Database Design Overview Conceptual Design. The Entity-Relationship (ER) Model CS430/630 Lecture 12 Conceptual design The Entity-Relationship (ER) Model, UML High-level, close to human thinking Semantic

### Entity-Relationship Model

UNIT -2 Entity-Relationship Model Introduction to ER Model ER model is represents real world situations using concepts, which are commonly used by people. It allows defining a representation of the real

### CS2Bh: Current Technologies. Introduction to XML and Relational Databases. Introduction to Databases. Why databases? Why not use XML?

CS2Bh: Current Technologies Introduction to XML and Relational Databases Spring 2005 Introduction to Databases CS2 Spring 2005 (LN5) 1 Why databases? Why not use XML? What is missing from XML: Consistency

### Databases and BigData

Eduardo Cunha de Almeida eduardo.almeida@uni.lu Outline of the course Introduction Database Systems (E. Almeida) Distributed Hash Tables and P2P (C. Cassagnes) NewSQL (D. Kim and J. Meira) NoSQL (D. Kim)

### Answer Key. UNIVERSITY OF CALIFORNIA College of Engineering Department of EECS, Computer Science Division

Answer Key UNIVERSITY OF CALIFORNIA College of Engineering Department of EECS, Computer Science Division CS186 Fall 2003 Eben Haber Midterm Midterm Exam: Introduction to Database Systems This exam has

### SQL DATA DEFINITION: KEY CONSTRAINTS. CS121: Introduction to Relational Database Systems Fall 2015 Lecture 7

SQL DATA DEFINITION: KEY CONSTRAINTS CS121: Introduction to Relational Database Systems Fall 2015 Lecture 7 Data Definition 2 Covered most of SQL data manipulation operations Continue exploration of SQL

### Review: Participation Constraints

Review: Participation Constraints Does every department have a manager? If so, this is a participation constraint: the participation of Departments in Manages is said to be total (vs. partial). Every did

### Database Design. Goal: specification of database schema Methodology: E-R Model is viewed as a set of

Database Design Goal: specification of database schema Methodology: Use E-R model to get a high-level graphical view of essential components of the model and how they are related Convert E-R diagram to

### Network Model APPENDIXD. D.1 Basic Concepts

APPENDIXD Network Model In the relational model, the data and the relationships among data are represented by a collection of tables. The network model differs from the relational model in that data are

### Designing Databases. Introduction

Designing Databases C Introduction Businesses rely on databases for accurate, up-to-date information. Without access to mission critical data, most businesses are unable to perform their normal daily functions,

### IINF 202 Introduction to Data and Databases (Spring 2012)

1 IINF 202 Introduction to Data and Databases (Spring 2012) Class Meets Times: Tuesday 7:15 PM 8:35 PM Thursday 7:15 PM 8:35 PM Location: SS 134 Instructor: Dima Kassab Email: dk155686@albany.edu Office

### Database Design. Database Design I: The Entity-Relationship Model. Entity Type (con t) Chapter 4. Entity: an object that is involved in the enterprise

Database Design Database Design I: The Entity-Relationship Model Chapter 4 Goal: specification of database schema Methodology: Use E-R R model to get a high-level graphical view of essential components

### Review Entity-Relationship Diagrams and the Relational Model. Data Models. Review. Why Study the Relational Model? Steps in Database Design

Review Entity-Relationship Diagrams and the Relational Model CS 186, Fall 2007, Lecture 2 R & G, Chaps. 2&3 Why use a DBMS? OS provides RAM and disk A relationship, I think, is like a shark, you know?

### Relational model. Relational model - practice. Relational Database Definitions 9/27/11. Relational model. Relational Database: Terminology

COS 597A: Principles of Database and Information Systems elational model elational model A formal (mathematical) model to represent objects (data/information), relationships between objects Constraints

### CMU - SCS 15-415/15-615 Database Applications Spring 2013, C. Faloutsos Homework 1: E.R. + Formal Q.L. Deadline: 1:30pm on Tuesday, 2/5/2013

CMU - SCS 15-415/15-615 Database Applications Spring 2013, C. Faloutsos Homework 1: E.R. + Formal Q.L. Deadline: 1:30pm on Tuesday, 2/5/2013 Reminders - IMPORTANT: Like all homeworks, it has to be done

### BİL 354 Veritabanı Sistemleri. Entity-Relationship Model

BİL 354 Veritabanı Sistemleri Entity-Relationship Model Steps in building a DB application Pick application domain Conceptual design How can I describe that data? What data do I need for my application

### Chapter 13: Query Optimization

Chapter 13: Query Optimization Database System Concepts, 6 th Ed. See www.db-book.com for conditions on re-use Chapter 13: Query Optimization Introduction Transformation of Relational Expressions Catalog

### Designing a Database Schema

Week 10: Database Design Database Design From an ER Schema to a Relational One Restructuring an ER schema Performance Analysis Analysis of Redundancies, Removing Generalizations Translation into a Relational

### Advance DBMS. Structured Query Language (SQL)

Structured Query Language (SQL) Introduction Commercial database systems use more user friendly language to specify the queries. SQL is the most influential commercially marketed product language. Other

### SQL SELECT Query: Intermediate

SQL SELECT Query: Intermediate IT 4153 Advanced Database J.G. Zheng Spring 2012 Overview SQL Select Expression Alias revisit Aggregate functions - complete Table join - complete Sub-query in where Limiting

### DATABASE MANAGEMENT SYSTEMS. Question Bank:

DATABASE MANAGEMENT SYSTEMS Question Bank: UNIT 1 1. Define Database? 2. What is a DBMS? 3. What is the need for database systems? 4. Define tupule? 5. What are the responsibilities of DBA? 6. Define schema?

### IT2305 Database Systems I (Compulsory)

Database Systems I (Compulsory) INTRODUCTION This is one of the 4 modules designed for Semester 2 of Bachelor of Information Technology Degree program. CREDITS: 04 LEARNING OUTCOMES On completion of this

### Databases What the Specification Says

Databases What the Specification Says Describe flat files and relational databases, explaining the differences between them; Design a simple relational database to the third normal form (3NF), using entityrelationship

### XV. The Entity-Relationship Model

XV. The Entity-Relationship Model The Entity-Relationship Model Entities, Relationships and Attributes Cardinalities, Identifiers and Generalization Documentation of E-R Diagrams and Business Rules The

### Chapter 6: Integrity Constraints

Chapter 6: Integrity Constraints Domain Constraints Referential Integrity Assertions Triggers Functional Dependencies Database Systems Concepts 6.1 Silberschatz, Korth and Sudarshan c 1997 Domain Constraints

### The Structured Query Language. De facto standard used to interact with relational DB management systems Two major branches

CSI 2132 Tutorial 6 The Structured Query Language (SQL) The Structured Query Language De facto standard used to interact with relational DB management systems Two major branches DDL (Data Definition Language)

### Conceptual Design: Entity Relationship Models. Objectives. Overview

Conceptual Design: Entity Relationship Models Craig Van Slyke, University of Central Florida cvanslyke@bus.ucf.edu John Day, Ohio University Objectives Define terms related to entity relationship modeling,

### 7. Databases and Database Management Systems

7. Databases and Database Management Systems 7.1 What is a File? A file is a collection of data or information that has a name, called the Filename. There are many different types of files: Data files

### We know how to query a database using SQL. A set of tables and their schemas are given Data are properly loaded

E-R Diagram Database Development We know how to query a database using SQL A set of tables and their schemas are given Data are properly loaded But, how can we develop appropriate tables and their schema

### Basic Concepts. Chapter A: Network Model. Cont.) Data-Structure Diagrams (Cont( Data-Structure Diagrams. General Relationships. The DBTG CODASYL Model

Chapter A: Network Model Basic Concepts Basic Concepts Data-Structure Diagrams The DBTG CODASYL Model DBTG Data-Retrieval Facility DBTG Update Facility DBTG Set-Processing Facility Mapping of Networks

### 1 Structured Query Language: Again. 2 Joining Tables

1 Structured Query Language: Again So far we ve only seen the basic features of SQL. More often than not, you can get away with just using the basic SELECT, INSERT, UPDATE, or DELETE statements. Sometimes

### 3. Relational Model and Relational Algebra

ECS-165A WQ 11 36 3. Relational Model and Relational Algebra Contents Fundamental Concepts of the Relational Model Integrity Constraints Translation ER schema Relational Database Schema Relational Algebra

### Database Design Final Project

Database Design 2015-2016 Database Design Final Project مشروع قاعدة بیانات ھو مشروع على طول السنة لاعطاء الطلبة الفرصة لتطویر قاعدة بیانات باستخدام نظام ادراة قواعد البیانات التجاریة حیث یبین الجدول رقم

### Databases. DSIC. Academic Year 2010-2011

Databases DSIC. Academic Year 2010-2011 1 Lecturer José Hernández-Orallo Office 236, 2nd floor DSIC. Email: jorallo@dsic.upv.es http://www.dsic.upv.es/~jorallo/docent/bda/bdaeng.html Attention hours On

### IV. The (Extended) Entity-Relationship Model

IV. The (Extended) Entity-Relationship Model The Extended Entity-Relationship (EER) Model Entities, Relationships and Attributes Cardinalities, Identifiers and Generalization Documentation of EER Diagrams

### CMPT 354 Database Systems. Simon Fraser University Summer 2016. Instructor: Oliver Schulte

CMPT 354 Database Systems Simon Fraser University Summer 2016 Instructor: Oliver Schulte Assignment 1: Entity-Relationship Modeling. The Relational Model. MS SQL Server. Instructions: Check the instructions

### Relational Databases

Relational Databases Jan Chomicki University at Buffalo Jan Chomicki () Relational databases 1 / 18 Relational data model Domain domain: predefined set of atomic values: integers, strings,... every attribute

### Instant SQL Programming

Instant SQL Programming Joe Celko Wrox Press Ltd. INSTANT Table of Contents Introduction 1 What Can SQL Do for Me? 2 Who Should Use This Book? 2 How To Use This Book 3 What You Should Know 3 Conventions

### SQL DDL. DBS Database Systems Designing Relational Databases. Inclusion Constraints. Key Constraints

DBS Database Systems Designing Relational Databases Peter Buneman 12 October 2010 SQL DDL In its simplest use, SQL s Data Definition Language (DDL) provides a name and a type for each column of a table.

### CSC 443 Fall 2011 Dr. R. M. Siegfried. Answers to Assignment #1

Answers to Assignment #1 1.14. Consider the Database below: If the name of the 'CS' (Computer Science) Department changes to 'CSSE' (Computer Science and Software Engineering) Department and the corresponding

### CIS 631 Database Management Systems Sample Final Exam

CIS 631 Database Management Systems Sample Final Exam 1. (25 points) Match the items from the left column with those in the right and place the letters in the empty slots. k 1. Single-level index files

### Database Sample Examination

Part 1: SQL Database Sample Examination (Spring 2007) Question 1: Draw a simple ER diagram that results in a primary key/foreign key constraint to be created between the tables: CREATE TABLE Salespersons

### Exercises. a. Find the total number of people who owned cars that were involved in accidents

42 Chapter 4 SQL Exercises 4.1 Consider the insurance database of Figure 4.12, where the primary keys are underlined. Construct the following SQL queries for this relational database. a. Find the total

### Introduction to normalization. Introduction to normalization

Introduction to normalization Lecture 4 Instructor Anna Sidorova Agenda Presentation Review of relational models, in class exersise Introduction to normalization In-class exercises Discussion of HW2 1

### Module Contact: Dr. Beatriz de la Iglesia, CMP Copyright of the University of East Anglia Version 1

UNIVERSITY OF EAST ANGLIA School of Computing Sciences Main Series UG Examination 2012-13 DATABASE SYSTEMS CMPC2B08 Time allowed: 3 hours Answer THREE questions. All questions carry equal weight. Notes

### Chapter 1: Introduction. Database Management System (DBMS) University Database Example

This image cannot currently be displayed. Chapter 1: Introduction Database System Concepts, 6 th Ed. See www.db-book.com for conditions on re-use Database Management System (DBMS) DBMS contains information

### Chapter 3. Data Modeling Using the Entity-Relationship (ER) Model

Chapter 3 Data Modeling Using the Entity-Relationship (ER) Model Chapter Outline Overview of Database Design Process Example Database Application (COMPANY) ER Model Concepts Entities and Attributes Entity

### Quiz 2: Database Systems I Instructor: Hassan Khosravi Spring 2012 CMPT 354

Quiz 2: Database Systems I Instructor: Hassan Khosravi Spring 2012 CMPT 354 1. (10) Convert the below E/R diagram to a relational database schema, using each of the following approaches: (3)The straight

### Introduction to database management systems

Introduction to database management systems Database management systems module Myself: researcher in INRIA Futurs, Ioana.Manolescu@inria.fr The course: follows (part of) the book "", Fourth Edition Abraham

### Bridge from Entity Relationship modeling to creating SQL databases, tables, & relations

1 Topics for this week: 1. Good Design 2. Functional Dependencies 3. Normalization Readings for this week: 1. E&N, Ch. 10.1-10.6; 12.2 2. Quickstart, Ch. 3 3. Complete the tutorial at http://sqlcourse2.com/

### SQL Simple Queries. Chapter 3.1 V3.0. Copyright @ Napier University Dr Gordon Russell

SQL Simple Queries Chapter 3.1 V3.0 Copyright @ Napier University Dr Gordon Russell Introduction SQL is the Structured Query Language It is used to interact with the DBMS SQL can Create Schemas in the

### Comp 5311 Database Management Systems. 3. Structured Query Language 1

Comp 5311 Database Management Systems 3. Structured Query Language 1 1 Aspects of SQL Most common Query Language used in all commercial systems Discussion is based on the SQL92 Standard. Commercial products

PART-I TYPICAL QUESTIONS & ANSWERS OBJECTIVE TYPE QUESTIONS Each question carries 2 marks. Choose the correct or best alternative in the following: Q.1 In the relational modes, cardinality is termed as:

### Once the schema has been designed, it can be implemented in the RDBMS.

2. Creating a database Designing the database schema... 1 Representing Classes, Attributes and Objects... 2 Data types... 5 Additional constraints... 6 Choosing the right fields... 7 Implementing a table