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SQL Queries for Mere Mortals: A Hands-On Guide to Data Manipulation in SQL, Fourth edition by John L. Viescas

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20Using Unlinked Data and “Driver” Tables

“If you only have a hammer, you tend to see every problem as a nail.”

—ABRAHAM MASLOW

Before you start this chapter, make sure you get a good night’s sleep! And while I’m doling out warnings, perhaps you should also make sure your seatbelt is securely fastened. I promised that I would introduce you to concepts that make you think “outside the box.” In this chapter, I am going to tackle problems that can be solved using unlinked data—problems where you will use more than one table in your FROM clause, but you won’t specify ...

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