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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><HTML><HEAD> <TITLE>Teach Yourself SQL in 21 Days, Second Edition -- Week 3 In Review</TITLE></HEAD><BODY TEXT="#000000" BGCOLOR="#FFFFFF"><CENTER><H1><IMG SRC="../buttonart/sams.gif" WIDTH="171" HEIGHT="66" ALIGN="BOTTOM" BORDER="0"><BR><FONT COLOR="#000077">Teach Yourself SQL in 21 Days, Second Edition</FONT></H1></CENTER><CENTER><P><A HREF="../ch21/ch21.htm"><IMG SRC="../buttonart/previous.gif" WIDTH="128" HEIGHT="28"ALIGN="BOTTOM" ALT="Previous chapter" BORDER="0"></A><A HREF="../apa/apa.htm"><IMGSRC="../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><FONT COLOR="#000077">Week 3 In Review</FONT></H1></CENTER><P>This week should have been very productive. Week 3 shows you the flexibility ofSQL, explains how you can apply these features to real-world problems, and introducessome popular extensions to SQL. You should know how to use the tools that are availablewith your implementation of SQL to make your code more readable. By now you realizethat all implementations of SQL share the same general concepts, although the syntaxmay differ slightly.</P><P>You should have a clear understanding of the data dictionary, what data it contains,and how to retrieve useful information from it. If you understand how to generateSQL from another SQL statement, you should be ready to fly to unlimited heights.</P><P>What about errors? You will never be immune from syntax errors or logical mistakes,but as you gain experience with SQL, you will learn how to avoid many problems. Butthen again, errors can be excellent learning opportunities.</P><CENTER><P><HR><A HREF="../ch21/ch21.htm"><IMG SRC="../buttonart/previous.gif" WIDTH="128" HEIGHT="28"ALIGN="BOTTOM" ALT="Previous chapter" BORDER="0"></A><A HREF="../apa/apa.htm"><IMGSRC="../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>⌨️ 快捷键说明
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