What is the difference between associative arrays and nested tables?

Hello
What is the difference between associative arrays and nested tables?

nested tables cannot be indexed by other than pls_integer and unlike nested tables table associative cananot be declared at the schema level.

is there any other difference set apart from the diff above 2?

user13710379 wrote:
What is the difference between associative arrays and nested tables?

Name-value pairs (associative) against a list of values (table standard/nested table).

nested tables cannot be indexed by other than pls_integer

They are not "indexed" the way in which an associative array is indexed. A standard table is referenced by the position of the cell in the table. This position is essentially the offset of the memory of the cell from the start address of the table.

Can not solve a cell in an associative array directly via a memory offset index. You place a cell reference value it by his 'name' (a search in the linked list/hash table).

The following example shows the difference between the pairs of name / value and a list of core values.

SQL> declare
  2          --// associative arrays are NAME-VALUE pairs
  3          type TArr1 is table of varchar2(10) index by pls_integer;
  4          type TArr2 is table of varchar2(10) index by varchar2(10);
  5
  6          arr1    TArr1;
  7          arr2    TArr2;
  8  begin
  9          arr1(100) := '1st entry';
 10          arr1(1) := '2nd entry';
 11          arr1(5) := '3rd entry';
 12
 13          arr2('john') := 'New York';
 14          arr2('jane') := 'Paris';
 15          arr2('jack') := 'London';
 16
 17  end;
 18  /

PL/SQL procedure successfully completed.

SQL>
SQL>
SQL> declare
  2          --// standard arrays are lists
  3          type TArr3 is table of varchar2(10);
  4          type TArr4 is table of number;
  5
  6          arr3    TArr3;
  7          arr4    TArr4;
  8  begin
  9          arr3 := new TArr3( '1st entry', '2nd entry', '3rd entry' );
 10
 11          arr4 := new TArr4( 100, 1, 5 );
 12  end;
 13  /

PL/SQL procedure successfully completed.

SQL>

Tags: Database

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