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Oracle PL/SQL in 10 Minutes, Sams Teach Yourself by Ben Forta

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Lesson 11. Using Data Manipulation Functions

In this lesson, you’ll learn what functions are, what types of functions Oracle supports, and how to use these functions.

Understanding Functions

Like almost any other computer language, SQL supports the use of functions to manipulate data. Functions are operations that are usually performed on data, usually to facilitate conversion and manipulation.

An example of a function is the RTrim() that we used in the last lesson to trim any spaces from the end of a string.

Note: Functions Are Less Portable Than SQL

Code that runs on multiple systems is said to be portable. Most SQL statements are relatively portable, and when differences between SQL implementations do occur, they are usually not that difficult ...

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