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This chapter is from the book

This chapter is from the book

The Language of SQL, 3rd EditionThe Language of SQL, 3rd Edition

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This chapter is from the book

This chapter is from the book

The Language of SQL, 3rd EditionThe Language of SQL, 3rd Edition

Learn More Buy

Looking Ahead

This chapter covered the important topic of how to create complex expressions of selection logic. The basic Boolean operators used in this endeavor were AND, OR, and NOT. We also discussed the BETWEEN and IN operators, which allow for a more concise statement of the AND and OR operators in certain situations. Parentheses are another essential tool in the formulation of complex expressions. By using parentheses, you can create almost every imaginable logical condition. Finally, we discussed how to deal with NULL values when selecting data.

In the next chapter, we’ll revisit the columnlist and explore an important construct that will allow us to inject logic into the individual columns in the columnlist. This is referred to as conditional logic. By using the same Boolean logic operators discussed in this chapter, along with a few additional keywords, we’ll be able to specify logic that determines how individual columns in the columnlist are displayed.

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