Internal components of the collection are called elements. Each element of the collection can be access by using unique subscripts. To create a collection type it is necessary to define a collection type and then create a variable of that type.
There are three types of collections
1. Associated Array ( index-by table/ PL/SQL table ) à An unbounded collection
2. VARRAY ( variable size array) à Bounded collection
3. Nested table à Unbounded collection
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