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<FONT COLOR="#000077">Teach Yourself SQL in 21 Days, Second Edition</FONT></H1>
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<H1><FONT COLOR="#000077">Week 3 In Review</FONT></H1>
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<P>This week should have been very productive. Week 3 shows you the flexibility of
SQL, explains how you can apply these features to real-world problems, and introduces
some popular extensions to SQL. You should know how to use the tools that are available
with your implementation of SQL to make your code more readable. By now you realize
that all implementations of SQL share the same general concepts, although the syntax
may 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 generate
SQL 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. But
then again, errors can be excellent learning opportunities.</P>
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