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Oracle PL/SQL Best Practices by Steven Feuerstein

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Chapter 3. Variables and Data Structures

PL/SQL is a strongly typed language. This means that before you can work with any kind of data structure, you must first declare it. And when you declare it, you specify its type and, optionally, an initial or default value. All declarations of these variables must be made in the declaration section of your anonymous block, procedure, function, or package.

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