
Teach Yourself SQL in 21 Days, Second Edition


Week 1 At A Glance
Let's Get Started
Week 1 introduces SQL from a historical and theoretical perspective. The
first statement you learn about is the SELECT statement, which enables
you to retrieve data from the database based on various user-specified
options. Also during Week 1 you study SQL functions, query joins, and SQL
subqueries (a query within a query). Many examples help you understand
these important topics. These examples use Oracle7, Sybase SQL Server,
Microsoft Access, and Microsoft Query and highlight some of the similarities
and differences among the products. The content of the examples should
be useful and interesting to a broad group of readers.


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