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A varray has a maximum size, which you specify in its type definition.

A varray can contain a varying number of elements, from zero (when empty) to the maximum size.

DECLARE 2 -- Associative array indexed by string: 3 4 TYPE population IS TABLE OF NUMBER -- Associative array type 5 INDEX BY VARCHAR2(64); 6 7 city_population population; -- Associative array variable 8 i VARCHAR2(64); 9 10 BEGIN 11 -- Add new elements to associative array: 12 13 city_population('Smallville') := 2000; 14 city_population('Midland') := 750000; 15 city_population('Megalopolis') := 1000000; 16 17 -- Change value associated with key 'Smallville': 18 19 city_population('Smallville') := 2001; 20 21 -- Print associative array: 22 23 i := city_population.

FIRST; 24 25 WHILE i IS NOT NULL LOOP 26 DBMS_Output.

This chapter explains how to create and use PL/SQL collection and record variables.

These composite variables have internal components that you can treat as individual variables.

You can pass composite variables to subprograms as a parameters.

An associative array does not need the disk space or network operations of a database table, but an associative array cannot be manipulated by SQL statements (such as ).

For examples, see Using Multidimensional Collections. Topics: An associative array (also called an index-by table) is a set of key-value pairs.

Each key is unique, and is used to locate the corresponding value. Using a key-value pair for the first time adds that pair to the associative array.

Using the same key with a different value changes the value.

Example 5-1 declares an associative array that is indexed by a string, populates it, and prints it.

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