Sams Teach Yourself SQL in 24 Hours

By Ron Plew and Ryan Stephens

• Table of Contents
  • Copyright
  • About the Authors
  • Acknowledgments
  • Tell Us What You Think!
  • Introduction
  • Part I: A SQL Concepts Overview
  • Hour 1. Welcome to the World of SQL
  • Part II: Building Your Database
  • Hour 2. Defining Data Structures
  • Hour 3. Managing Database Objects
  • Hour 4. The Normalization Process
  • Hour 5. Manipulating Data
  • Hour 6. Managing Database Transactions
  • Part III: Getting Effective Results from Queries
  • Hour 7. Introduction to the Database Query
  • Hour 8. Using Operators to Categorize Data
  • Hour 9. Summarizing Data Results from a Query
  • Hour 10. Sorting and Grouping Data
  • Hour 11. Restructuring the Appearance of Data
  • Hour 12. Understanding Dates and Times
  • Part IV: Building Sophisticated Database Queries
  • Hour 13. Joining Tables in Queries
  • Hour 14. Using Subqueries to Define Unknown Data
  • Hour 15. Combining Multiple Queries into One
  • Part V: SQL Performance Tuning
  • Hour 16. Using Indexes to Improve Performance
  • Hour 17. Improving Database Performance
  • Part VI: Using SQL to Manage Users and Security
  • Hour 18. Managing Database Users
  • Hour 19. Managing Database Security
    • What Is Database Security?
    • How Does Security Differ from User Management?
    • What Are Privileges?
    • Controlling User Access
    • Controlling Privileges Through Roles
    • Summary
    • Q&A
    • Workshop
  • Part VII: Summarized Data Structures
  • Hour 20. Creating and Using Views and Synonyms
  • Hour 21. Working with the System Catalog
  • Part VIII: Applying SQL Fundamentals in Today's World
  • Hour 22. Advanced SQL Topics
  • Hour 23. Extending SQL to the Enterprise, the Internet, and the Intranet
  • Hour 24. Extensions to Standard SQL
  • Part IX: Appendixes
  • Appendix A. Common SQL Commands
  • Appendix B. Using MySQL for Exercises
  • Appendix C. Answers to Quizzes and Exercises
  • Appendix D. CREATE TABLE Statements for Book Examples
  • Appendix E. INSERT Statements for Data in Book Examples
  • Appendix F. Glossary
  • Appendix G. Bonus Exercises

Q&A

1. If a user forgets his or her password, what should the user do to gain access to the database again?

   The user should go to his or her immediate management or an available help desk. A help desk should be able to reset a user's password. If not, the DBA or security officer can reset the password. The user should change the password to a password of his or her choosing as soon as the password is reset and the user is notified.

2. What could I do if I wanted to grant CONNECT to a user, but the user does not need all the privileges that are assigned to the connect role?

   You would simply not grant CONNECT, but only the privileges required. Should you ever grant CONNECT and the user no longer needs all the privileges that go with it, simply revoke CONNECT from the user and grant the specific privileges required.

3. Why is it so important for the new user to change the password when received from whomever created the new user?

   An initial password is assigned upon creation of the user ID. No one, not even the DBA or management, should know a user's password. The password should be kept a secret at all times to prevent another user from logging on to the database under another user's account.

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