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Expression

If you are the least bit familiar with programming languages, you know that expressions are anything that, when calculated, result in a value. For instance, 1 + 1 = 2 is an example of an expression. Expressions in SQL work much the same way. Consider the following data from the customers table:

CustomerID FirstName LastName
1 Zak Ruvalcaba
2 David Levinson
3 Matthew Pizzi
4 Jessica Ruvalcaba



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