Web Reference: You can define collections of collections (directly or indirectly). The multilevel collection is one of the most complicated and powerful features of PL/SQL.... With a multilevel nested table collection of nested tables, you must specify a nested-table storage clause (STORE AS) for both the inner set and the outer set of nested tables. You must have as many nested table storage clauses as you have levels of nested tables in a collection. In this module, we describe three-level data structures and multilevel models which can be used to analyse them. Of course, there is nothing to stop data structures being even more complex and having four or more levels and we shall also consider examples of such data structures in this module.
YouTube Excerpt: You can define collections of collections (directly or indirectly). The
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