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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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6Filtering Your Data

“I keep six honest-serving men (They taught me all I knew.) Their names are What and Why and When and How and Where and Who.”

—RUDYARD KIPLING “I KEEP SIX HONEST-SERVING MEN

In the previous two chapters, I discussed the techniques you use to see all the information in a given table. I also discussed how to create and use expressions to broaden or narrow the scope of that information. In this chapter, I’ll show you how to fine-tune what you retrieve by filtering the information using ...

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