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Oracle PL/SQL Programming, 5th Edition by Bill Pribyl, Steven Feuerstein

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Chapter 18. Packages

A package is a grouping or packaging together of elements of PL/SQL code into a named scope. Packages provide a structure (both logically and physically) in which you can organize your programs and other PL/SQL elements such as cursors, TYPEs, and variables. They also offer significant, unique functionality, including the ability to hide logic and data from view, and to define and manipulate “global” or session-persistent data.

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