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Is there an easy way to declare a dynamic array in Oracle PL/SQL?

I need to use an array that can contain 100,000 numbers and other times I need to store only 3 numbers

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There are three types of collection in PL/SQL. Only the varrays have a fixed maximum number of elements. If you use a nested table or an associative array instead, you can add as many element as you want.

For further reading: PL/SQL Collections and Records

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