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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><HTML><HEAD> <TITLE>Teach Yourself SQL in 21 Days, Second Edition -- Introduction --</TITLE></HEAD><BODY TEXT="#000000" BGCOLOR="#FFFFFF"><CENTER><H1><IMG SRC="../buttonart/sams.gif" WIDTH="171" HEIGHT="66" ALIGN="BOTTOM" BORDER="0"></H1></CENTER><CENTER><P><A HREF="../wk1ag/wk1ag.htm"><IMG SRC="../buttonart/next.gif" WIDTH="128" HEIGHT="28"ALIGN="BOTTOM" ALT="Next chapter" BORDER="0"></A><A HREF="../index.htm"><IMG SRC="../buttonart/contents.gif"WIDTH="128" HEIGHT="28" ALIGN="BOTTOM" ALT="Contents" BORDER="0"></A> <HR></CENTER><CENTER><H1></H1></CENTER><CENTER><H1><FONT COLOR="#000077">Teach Yourself SQL in 21 Days, Second Edition</FONT></H1></CENTER><CENTER><H1><FONT COLOR="#000077"><BR>Acknowledgments</FONT></H1></CENTER><P>A special thanks to the following individuals: foremost to my loving wife, Tina,for her tolerance and endless support, to Dan Wilson for his contributions, and toThomas McCarthy at IUPUI. Also, thank you Jordan for your encouragement over thepast few years.</P><P>-- <I>Ryan K. Stephens</I></P><P>Special thanks to my wife for putting up with me through this busiest of times.I apologize to my mom for not seeing her as often as I should (I'll make it up toyou). Also, thanks to my loyal dog, Toby. He was with me every night and wouldn'tleave my side.</P><P>-- <I>Ronald Plew</I></P><P>Special thanks to the following people: Jeff Perkins, David Blankenbeckler, ShannonLittle, Jr., Clint and Linda Morgan, and Shannon and Kaye Little.</P><P>This book is dedicated to my beautiful wife, Becky. I am truly appreciative toyou for your support, encouragement, and love. Thanks for staying up with me duringall those late-night sessions. You are absolutely the best.</P><P>-- <I>Bryan Morgan</I></P><P>Thanks to my family, Leslie, Laura, Kelly, Valerie, Jeff, Mom, and Dad. Theirsupport made working on this book possible.</P><P>-- <I>Jeff Perkins</I><H1><FONT COLOR="#000077">About the Authors</FONT></H1><H4><FONT COLOR="#000077">Ryan K. Stephens</FONT></H4><P>Ryan K. Stephens started using SQL as a programmer/analyst while serving on activeduty in the Indiana Army National Guard. Hundreds of programs later, Ryan becamea database administrator. He currently works for Unisys Federal Systems, where heis responsible for government-owned databases throughout the United States. In additionto his full-time job, Ryan teaches SQL and various database classes at Indiana University-PurdueUniversity Indianapolis. He also serves part-time as a programmer for the IndianaArmy National Guard. Along with Ron Plew and two others, Ryan owns a U.S. patenton a modified chess game. Some of his interests include active sports, chess, nature,and writing. Ryan lives in Indianapolis with his wife, Tina, and their three dogs,Bailey, Onyx, and Sugar.</P><H4><FONT COLOR="#000077">Ronald R. Plew</FONT></H4><P>Ronald R. Plew is a database administrator for Unisys Federal Systems. He holdsa bachelor of science degree in business administration/management from the IndianaInstitute of Technology. He is an instructor for Indiana University-Purdue UniversityIndianapolis where he teaches SQL and various database classes. Ron also serves asa programmer for the Indiana Army National Guard. His hobbies include collectingIndy 500 racing memorabilia. He also owns and operates Plew's Indy 500 Museum. Helives in Indianapolis with his wife, Linda. They have four grown children (Leslie,Nancy, Angela, and Wendy) and eight grandchildren (Andy, Ryan, Holly, Morgan, Schyler,Heather, Gavin, and Regan).<H4><FONT COLOR="#000077">Bryan Morgan</FONT></H4><P>Bryan Morgan is a software developer with TASC, Inc., in Fort Walton Beach, Florida.In addition to writing code and chasing the golf balls he hits, Bryan has authoredseveral books for Sams Publishing including <I>Visual J++ Unleashed</I>, <I>JavaDeveloper's Reference</I>, and <I>Teach Yourself ODBC Programming in 21 Days</I>.He lives in Navarre, Florida, with his wife, Becky, and their daughter, Emma.<H4><FONT COLOR="#000077">Jeff Perkins</FONT></H4><P>Jeff Perkins is a senior software engineer with TYBRIN Corporation. He has beena program manager, team leader, project lead, technical lead, and analyst. A graduateof the United States Air Force Academy, he is a veteran with more than 2,500 hoursof flying time as a navigator and bombardier in the B-52. He has co-authored threeother books, <I>Teach Yourself NT Workstation in 24 Hours</I>, <I>Teach YourselfODBC Programming in 21 Days</I>, and <I>Teach Yourself ActiveX in 21 Days</I>.<H2><FONT COLOR="#000077">Tell Us What You Think!</FONT></H2><P>As a reader, you are the most important critic and commentator of our books. Wevalue your opinion and want to know what we're doing right, what we could do better,what areas you'd like to see us publish in, and any other words of wisdom you'rewilling to pass our way. You can help us make strong books that meet your needs andgive you the computer guidance you require.</P><P>Do you have access to CompuServe or the World Wide Web? Then check out our CompuServeforum by typing <B>GO SAMS</B> at any prompt. If you prefer the World Wide Web, checkout our site at <A HREF="http://www.mcp.com"><TT>http://www.mcp.com</TT></A>.<BLOCKQUOTE> <P><HR><FONT COLOR="#000077"><B>NOTE:</B></FONT> If you have a technical question about this book, call the technical support line at 317-581-3833 or send e-mail to <A HREF="mailto:support@mcp.com"><TT>support@mcp.com</TT></A>. <HR></BLOCKQUOTE><P>As the team leader of the group that created this book, I welcome your comments.You can fax, e-mail, or write me directly to let me know what you did or didn't likeabout this book--as well as what we can do to make our books stronger. Here's theinformation:</P><P>FAX: 317-581-4669</P><P>E-mail: <A HREF="mailto:enterprise_mgr@sams.mcp.com"><TT>enterprise_mgr@sams.mcp.com</TT></A></P><P>Mail: Rosemarie Graham <BR>Comments Department <BR>Sams Publishing <BR>201 W. 103rd Street <BR>Indianapolis, IN 46290<H1><FONT COLOR="#000077">Introduction</FONT></H1><H2><FONT COLOR="#000077">Who Should Read This Book?</FONT></H2><P>Late one Friday afternoon your boss comes into your undersized cubicle and dropsa new project on your desk. This project looks just like the others you have beenworking on except it includes ties to several databases. Recently your company decidedto move away from homegrown, flat-file data and is now using a relational database.You have seen terms like SQL, tables, records, queries, and RDBMS, but you don'tremember exactly what they all mean. You notice the due date on the program is three,no, make that two, weeks away. (Apparently it had been on your boss's desk for aweek!) As you begin looking for definitions and sample code to put those definitionsinto context, you discover this book.</P><P>This book is for people who want to learn the fundamentals of Structured QueryLanguage (SQL)--quickly. Through the use of countless examples, this book depictsall the major components of SQL as well as options that are available with variousdatabase implementations. You should be able to apply what you learn here to relationaldatabases in a business setting.<H2><FONT COLOR="#000077">Overview</FONT></H2><P>The first 14 days of this book show you how to use SQL to incorporate the powerof modern relational databases into your code. By the end of Week 1, you will beable to use basic SQL commands to retrieve selected data.<BLOCKQUOTE> <P><HR><FONT COLOR="#000077"><B>NOTE:</B></FONT><B> </B>If you are familiar with the basics and history of SQL, we suggest you skim the first week's chapters and begin in earnest with Day 8, "Manipulating Data." <HR></BLOCKQUOTE><P>At the end of Week 2, you will be able to use the more advanced features of SQL,such as stored procedures and triggers, to make your programs more powerful. Week3 teaches you how to streamline SQL code; use the data dictionary; use SQL to generatemore SQL code; work with PL/SQL, Transact-SQL, and SQL*Plus; and handle common SQLmistakes and errors.</P><P>The syntax of SQL is explained and then brought to life in examples using PersonalOracle7, Microsoft Query, and other database tools. You don't need access to anyof these products to use this book--it can stand alone as an SQL syntax reference.However, using one of these platforms and walking though the examples will help youunderstand the nuances.<H2><FONT COLOR="#000077">Conventions Used in This Book</FONT></H2><P>This book uses the following typeface conventions:<UL> <LI>Menu names are separated from menu options by a vertical bar (|). For example, File | Open means "select the Open option from the File menu." <P> <LI>New terms appear in <I>italic</I>. <P> <LI>All code in the listings that you type in (input) appears in <B><TT>boldface monospace</TT></B>. Output appears in standard <TT>monospace</TT>. <P> <LI>The input label and output label also identify the nature of the code. <P> <LI>Many code-related terms within the text also appear in <TT>monospace</TT>. <P> <LI>Paragraphs that begin with the analysis label explain the preceding code sample. <P> <LI>The syntax label identifies syntax statements.</UL><P>The following special design features enhance the text:<BLOCKQUOTE> <P><HR><FONT COLOR="#000077"><B>NOTE:</B></FONT> Notes explain interesting or important points that can help you understand SQL concepts and techniques. <HR></P> <P><HR><FONT COLOR="#000077"><B>TIP:</B></FONT> Tips are little pieces of information to begin to help you in real-world situations. Tips often offer shortcuts or information to make a task easier or faster. <HR><BR> <HR><FONT COLOR="#000077"><B>WARNING:</B></FONT> Warnings provide information about detrimental performance issues or dangerous errors. Pay careful attention to Warnings. <HR></BLOCKQUOTE><CENTER><H1></H1></CENTER><CENTER><P><HR><A HREF="../wk1ag/wk1ag.htm"><IMG SRC="../buttonart/next.gif" WIDTH="128" HEIGHT="28"ALIGN="BOTTOM" ALT="Next chapter" BORDER="0"></A><A HREF="../index.htm"><IMG SRC="../buttonart/contents.gif"WIDTH="128" HEIGHT="28" ALIGN="BOTTOM" ALT="Contents" BORDER="0"></A> <BR><BR><BR><IMG SRC="../buttonart/corp.gif" WIDTH="284" HEIGHT="45" ALIGN="BOTTOM" ALT="Macmillan Computer Publishing USA"BORDER="0"></P><P>© <A HREF="../copy.htm">Copyright</A>, Macmillan Computer Publishing. Allrights reserved.</CENTER></BODY></HTML>?? 快捷鍵說明
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