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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 At A Glance</FONT></H1>
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<H2><FONT COLOR="#000077">Applying Your Knowledge of SQL</FONT></H2>
<P>Welcome to Week 3. So far you have learned the fundamentals of SQL and already
know enough to apply what you have learned to some real-life situations. This week
builds on the foundation established in Weeks 1 and 2. Day 15 shows you how to streamline
SQL statements for improved performance. Day 16 talks about the data dictionary,
or system catalog, of a relational database and shows you how to retrieve valuable
information. Day 17 extends the concept of using the data dictionary to generate
SQL as output from another SQL statement. You will learn the benefits of this technique
and discover how generating SQL can improve your efficiency on the job. Day 18 covers
Oracle's PL/SQL, or Oracle procedural language. PL/SQL is one of the many extensions
to standard SQL. Another extension is Sybase's and Microsoft Server's Transact-SQL,
which is covered on Day 19. Day 20 returns to Oracle to cover SQL*Plus, which allows
you to use advanced commands to communicate with the database. SQL*Plus also enables
you to format query-generated reports in an attractive manner. You can use SQL*Plus
in collaboration with PL/SQL. Day 21 examines errors and logical mistakes that relational
database users frequently encounter. We provide brief descriptions of the errors,
solutions, and tips on avoiding errors.</P>
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