6. Filtering Your Data
“I keep six honest-serving men(They taught me all I knew.)Their names are What and Why and Whenand How and Where and Who.”
—Rudyard Kipling“I keep six honest-serving men”
Topics Covered in This Chapter
Refining What You See Using WHERE
Nulls Revisited: A Cautionary Note
Expressing Conditions in Different Ways
In the previous two chapters, we discussed the techniques you use to see all the information in a given table. We also discussed how to create and use expressions to broaden or narrow the scope of that information. In this chapter, we’ll show you how to fine-tune what you retrieve by filtering the information using ...
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