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

Summary

You were shown the basics on implementing security in a SQL database or a relational database. You learned the basics of managing database users. The first step in implementing security at the database level for users is to create the user; after the user has been created, the user must be assigned certain privileges that allow the user access to specific parts of the database, and now ANSI allows the use of roles as discussed during this hour. Privileges can be granted to users or roles. There are two types of privileges: system and object privileges.

System privileges are those that allow the user to perform various different tasks within the database, such as actually connecting to the database, creating tables, creating users, altering the state of the database, and so on. Object privileges are those that allow a user access to specific objects within the database, such as the ability to select data or manipulate data in a specific table.

There are two commands in SQL that allow a user to grant and revoke privileges to and from other users or roles in the database: GRANT and REVOKE. These two commands are used to control the overall administration of privileges in the database. Although there are many other considerations for implementing security in a relational database, the basics that relate to the language of SQL were discussed during this hour.

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