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The data or information for the database are stored in these tables.

Tables are uniquely identified by their names and are comprised of columns and rows.

And it does precisely that through its implementation of the datatype, such as a number or string.

It’s rare, in fact, that the data with which you are working is just a single value, so records and other composite datatypes are likely to figure prominently in your PL/SQL programs.

Ambrose Bierce Many programming techniques use collection types such as arrays, bags, lists, nested tables, sets, and trees.