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Oracle SQL by Carol McCullough-Dieter, Gavin JT Powell

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14

Expressions

In this chapter:

  • How can expressions be classified?

  • What are regular expressions?

  • What is the Oracle Expression Filter?

There are three distinct parts to this chapter. The first part covers details of expressions in Oracle, which are covered more or less throughout this book. This chapter attempts to simply break things into logical parts. The second part of this chapter deals with regular expressions catering for text pattern matching and searching. The third part briefly covers the Oracle Expression Filter.

A fundamental but often difficult to answer question is this: What is an expression? There is a simple explanation. Anything resulting in a value is an expression. An expression can consist of a single scalar value or a ...

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