How to implement a linked list in oracle ?

HI All
I want to know if there a way to implement a linked list in oracle ?
Thanks in Advanced
Naama

A linked list is an array of the relevant data plus an indicator of the next and previous entries, right?
Sounds easily achievable with any of the plsql collection types.
The simplest would be a plsql associative array of a record
Assignments of records in collections is always a bit hamfisted compared to sql objects types though (IMO).
Something like ?
DECLARE
TYPE r_payload IS RECORD
(col1 number,
  col2 number);
TYPE r_array_entry is RECORD
(prev_entry PLS_INTEGER,
  next_entry PLS_INTEGER,
  payload    r_payload);
TYPE t_array IS TABLE OF r_array_entry INDEX BY PLS_INTEGER;
v_array t_array;
BEGIN
NULL;
END; 
  The use case for such a structure in properly coded SQL & PL/SQL is possibly the harder question.

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         ,table_name
         ,r_constraint_name
         ,delete_rule
         ,status
    from user_constraints;
    The constraint_type will show P (Primary Key), C (Check), R (Referential) etc
    However, you can use queries to find Object Dependencies in the Database.
    Read more from the SQL Reference Manual to get more knowledge in this area.

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