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An associative array (also called an index-by table) is a map structure (set of key-value pair) implemented with the “table of index by” keyword

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Syntax

TYPE table_of_type IS TABLE OF VARCHAR2(30) ; -- default indexed by integer  -- List of Called a Nested table

Syntax

Characteristic

• Each key is unique
• The key can be either an integer or a string.

Example

set serveroutput on;
DECLARE
  TYPE filter_map_type IS TABLE OF VARCHAR2(30) INDEX BY VARCHAR2(30);
  filter_map filter_map_type;
  key_map VARCHAR2(30);
BEGIN

filter_map('Hello Key') := 'Hello Value';
filter_map('Hello Key 2') := 'Hello Value 2';
filter_map('Hello Key') := 'Hello Value 3';

key_map := filter_map.FIRST; 
WHILE key_map IS NOT NULL LOOP
   
   DBMS_OUTPUT.Put_Line('element(' || key_map || '): ' || filter_map(key_map));
   key_map := filter_map.NEXT(key_map);
   
END LOOP;
END;
/

PL/SQL procedure successfully completed.

element(Hello Key): Hello Value 3
element(Hello Key 2): Hello Value 2