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Advanced SQL Database Programmer

Handbook

Donald K. Burleson

Joe Celko

John Paul Cook

Peter Gulutzan

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BMC Software Inc.

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iii

Advanced SQL Database Programmers

Handbook

By Donald K. Burleson, Joe Celko, John Paul Cook, and

Peter Gulutzan

Printed in the United States of America.

Series Editor: Donald K. Burleson

Production Manager: John Lavender

Production Editor: Teri Wade

Cover Design: Bryan Hoff

Printing History:

August, 2003 for First Edition

Oracle, Oracle7, Oracle8, Oracle8i and Oracle9i are trademarks of Oracle Corporation. Oracle In-Focus is a registered Trademark of Rampant TechPress. Many of the designations used by computer vendors to distinguish their products are claimed as Trademarks. All names known to Rampant TechPress to be trademark names appear in this text as initial caps. The information provided by the authors of this work is believed to be accurate and reliable, but because of the possibility of human error by our authors and staff, BMC Software, DBAZine and Rampant TechPress cannot guarantee the accuracy or completeness of any information included in this work and is not responsible for any errors, omissions or inaccurate results obtained from the use of information or scripts in this work. Links to external sites are subject to change; DBAZine.com, BMC Software and Rampant TechPress do not control or endorse the content of these external web sites, and are not responsible for their content.

ISBN 0-9744355-2-X

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Conventions Used in this Book ....................................................vii About the Authors ...........................................................................ix Chapter 1 - SQL as a Second Language.................................1 Thinking in SQL by Joe Celko........................................................1 Chapter 2 - SQL View Internals.............................................7 SQL Views Transformed by Peter Gulutzan................................7

Syntax ..................................................................................................7

Cheerful Little Fact #1:................................................................8 Cheerful Little Fact #2:................................................................8 View Merge.........................................................................................9 Table1 .......................................................................................... 10 The Small Problem with View Merge......................................... 13 Temporary Tables........................................................................... 14 Permanent Materialized Views..................................................... 15 UNION ALL Views...................................................................... 18 Alternatives to Views..................................................................... 19

Tips................................................................................................... 21

References........................................................................................ 21

Chapter 3 - SQL JOIN.........................................................25 Relational Division by Joe Celko ................................................. 25 Chapter 4 - SQL UNION..................................................... 31 Set Operations by Joe Celko......................................................... 31 Introduction..................................................................................... 31 Set Operations: Union................................................................... 32 Chapter 5 - SQL NULL .......................................................37 Selection by Joe Celko................................................................... 37 Introduction..................................................................................... 37

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v The Null of It All............................................................................ 37 Defining a Three-valued Logic..................................................... 39 Wonder Shorthands....................................................................... 40 Chapter 6 - Specifying Time................................................ 41 Killing Time by Joe Celko............................................................. 41 Timing is Everything...................................................................... 41 Specifying "Lawful Time"............................................................. 43 Avoid Headaches with Preventive Maintenance....................... 44 Chapter 7 - SQL TIMESTAMP datatype ............................45 Keeping Time by Joe Celko.......................................................... 45 Chapter 8 - Internals of the IDENTITY datatype Column.49 The Ghost of Sequential Processing by Joe Celko.................... 49 Early SQL and Contiguous Storage............................................. 49 IDENTITY Crisis.......................................................................... 50 Chapter 9 - Keyword Search Queries...................................53 Keyword Searches by Joe Celko................................................... 53 Chapter 10 - The Cost of Calculated Columns.....................57 Calculated Columns by Joe Celko................................................ 57 Introduction..................................................................................... 57 Triggers........................................................................................ 58 INSERT INTO Statement....................................................... 60 UPDATE the Table................................................................... 61 Use a VIEW................................................................................ 61 Chapter 11 - Graphs in SQL .................................................63 Path Finder by Joe Celko .............................................................. 63 Chapter 12 - Finding the Gap in a Range............................69 Filling in the Gaps by Joe Celko .................................................. 69 Chapter 13 - SQL and the Web ............................................75 Web Databases by Joe Celko........................................................ 75 vi DBAzine.com

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Chapter 14 - Avoiding SQL Injection................................... 81 SQL Injection Security Threats by John Paul Cook................. 81 Creating a Test Application........................................................... 81 Understanding the Test Application............................................ 83 Understanding Dynamic SQL...................................................... 84 The Altered Logic Threat.............................................................. 85 The Multiple Statement Threat .................................................... 86 Prevention Through Code............................................................ 88 Prevention Through Stored Procedures..................................... 89 Prevention Through Least Privileges.......................................... 90 Conclusion....................................................................................... 91 Chapter 15 - Preventing SQL Worms...................................93 Preventing SQL Worms by John Paul Cook.............................. 93 Finding SQL Servers Including MSDE...................................... 93 Identifying Versions....................................................................... 96 SQL Security Tools........................................................................ 98 Preventing Worms.......................................................................... 98 MSDE Issues................................................................................... 99 .NET SDK MSDE and Visual Studio .NET...........................100 Application Center 2000..............................................................101 Baseline Security Analyzer...........................................................101 Chapter 16 - Basic SQL Tuning Hints............................... 103 SQL tuning by Donald K. Burleson..........................................103

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vii

Conventions Used in this Book

It is critical for any technical publication to follow rigorous standards and employ consistent punctuation conventions to make the text easy to read. However, this is not an easy task. Within Oracle there are many types of notation that can confuse a reader. Some Oraclequotesdbs_dbs7.pdfusesText_5

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