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In this tutorial, you will learn how to declare and initialize Oracle PL/SQL collections (Nested Tables) Nested tables extend the functionality of index-by tables by adding the ability to store nested tables within a database table. The syntax for creating a nested table type is the name of the type, and table_type is the type of each element in the nested table. A nested table can be thought as off as a table with two columns-key and value. Like an object type constructor, the constructor takes as an argument a list of elements, each of which is type compatible with the table element type.