Database Concepts (8th Edition)
8th Edition
ISBN: 9780134601533
Author: David M. Kroenke, David J. Auer, Scott L. Vandenberg, Robert C. Yoder
Publisher: PEARSON
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Chapter 5, Problem 5.4RQ
What is denormalization?
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Chapter 5 Solutions
Database Concepts (8th Edition)
Ch. 5 - Explain how entities are transformed into tables.Ch. 5 - Prob. 5.2RQCh. 5 - Prob. 5.3RQCh. 5 - What is denormalization?Ch. 5 - Prob. 5.5RQCh. 5 - Explain the problems that denormalized tables may...Ch. 5 - Explain how the representation of weak entities...Ch. 5 - Explain how supertype and subtype entities are...Ch. 5 - Prob. 5.9RQCh. 5 - Prob. 5.10RQ
Ch. 5 - Show two different ways to represent the 1:1...Ch. 5 - Prob. 5.12RQCh. 5 - Prob. 5.13RQCh. 5 - Prob. 5.14RQCh. 5 - Prob. 5.15RQCh. 5 - Prob. 5.16RQCh. 5 - For your answer to question 5.15, code an SQL...Ch. 5 - Prob. 5.18RQCh. 5 - Prob. 5.20RQCh. 5 - Prob. 5.21RQCh. 5 - Explain how the terms parent table and child table...Ch. 5 - For your answers to questions 5.20, 5.21, and...Ch. 5 - Prob. 5.24RQCh. 5 - Prob. 5.25RQCh. 5 - Prob. 5.26RQCh. 5 - Prob. 5.27RQCh. 5 - Prob. 5.28RQCh. 5 - Define the three types of recursive binary...Ch. 5 - Prob. 5.30RQCh. 5 - Prob. 5.31RQCh. 5 - Prob. 5.32RQCh. 5 - Prob. 5.33RQCh. 5 - Prob. 5.34RQCh. 5 - Code an SQL statement that creates a table with...
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- How is the processing of SQL DDL statements (such as CREATE TABLE) different from the processing required by DML statements?arrow_forwardThe following database will be used in this question: SALESREP SalesRepNo 654 734 345 434 RepName Jones Smith Chen Johnson HireDate 01/02/2005 02/03/2007 01/25/2004 11/23/2004 CUSTOMER CustNo 9870 8590 7840 4870 CustName Winston Gonzales Harris Miles Balance 500 350 SalesRepNo 345 434 654 345 800 100arrow_forwardExplain the difference between redundancy and diversity.arrow_forward
- What happens if your database does not enforce referential integrity? What kind of mistakes are more likely to occur?arrow_forwardormulate the following queries in Structured Query Language SQL The following tables form part of a database held in an RDBMS: Employee (empNo, fName, lName, address, DOB, sex, position, salary, deptNo) Department (deptNo, deptName, mgrEmpNo) Project (projNo, projName, deptNo) WorksOn (empNo, projNo, dateWorked, hoursWorked) where Employee contains employee details and empNo is the key. Department contains department details and deptNo is the key. mgrEmpNo identifies the employee who is the manager of the department. There is only one manager foreach department. Project contains details of the projects in each department and the key is projNo (notwo departments can run the same project). WorksOn contains details of the hours worked by employees on each project, and empNo/ projNo/dateWorked form the key. Formulate the following queries in Structured Query Language SQL List all the details of employees who are female and born after 1990. List employee numbers and names of all…arrow_forwardAppendix A: Database to be used for SQL select problems STUDENT Name Student_number Class Major CS Smith 17 1 Brown 8 CS COURSE Course_name Course number Credit hours Department Intro to Computer Science CS1310 4 CS Data Structures CS3320 4 CS Discrete Mathematics MATH2410 3 MATH Database CS3380 3 CS SECTION Section_identifier Course_number Semester Year Instructor 85 MATH2410 Fall 07 King 92 CS1310 Fall 07 Anderson 102 CS3320 Spring 08 Knuth 112 MATH2410 Fall 08 Chang 119 CS1310 Fall 08 Anderson 135 CS3380 Fall 08 Stone GRADE REPORT Student_number Section_identifier Grade 17 112 17 119 C 85 8. 92 8 102 8 135 A PREREQUISITE Course_number Prerequisite_number CS3380 CS3320 CS3380 MATH2410 CS3320 CS1310 Ex 5) Write SQL statement to retrieve the names of all students who took both sections 112 and 119. Show the result of this query applied to the given DB state. ANSWER: Ex 6) Write SQL statement to retrieve the names of all freshman students majoring in computer science. (Freshman students…arrow_forward
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