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20-Aug-2017 06:21

You can define collection types in a procedure, function, or package.

You can pass collection variables as parameters, to move data between client-side applications and stored subprograms.

PL/SQL offers these collection types: Although collections can have only one dimension, you can model multi-dimensional arrays by creating collections whose elements are also collections.

To use collections in an application, you define one or more PL/SQL types, then define variables of those types.

Nested tables can be stored in a database column, but associative arrays cannot.

Nested tables are appropriate for important data relationships that must be stored persistently.

In this chapter, you learn how those types let you reference and manipulate collections of data as whole objects.

You also learn how the datatype is an ordered group of elements, all of the same type.

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Each varray is stored as a single object, either inside the table of which it is a column (if the varray is less than 4KB) or outside the table but still in the same tablespace (if the varray is greater than 4KB).PL/SQL nested tables are like one-dimensional arrays.You can model multi-dimensional arrays by creating nested tables whose elements are also nested tables.To look up data that is more complex than single values, you can store PL/SQL records or SQL object types in collections.

Nested tables and varrays can also be attributes of object types.

This makes nested tables suitable for queries and updates that only affect some elements of the collection.

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