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Using Object IDs (OIDs) in Oracle 8

Oracle Tips by Mike Ault

Using REF, DEREF and VALUE

SQL> select REF(d) from dept d;

 

D                                                                                                  

--------------------------------------------------                                                  

0000280209A656BEEF11B811D1AD5B0060972CFBA8A656BEEE                                                 

11B811D1AD5B0060972CFBA8008000C10000                                                               

                                                                                                    

0000280209A656BEF011B811D1AD5B0060972CFBA8A656BEEE                                                 

11B811D1AD5B0060972CFBA8008000C10001                                                                

                                                                                                   

SQL> insert into emp select 'Mike Ault',1, REF(d) from dept d

  SEE CODE DEPOT FOR FULL SCRIPTS

SQL> /

 

1 row created.

 

SQL> select * from emp;

 

ENAME                                               ENUMBER                                                 

----------------------------------------------  ---------------------------------

Mike Ault                                                                             1

EDEPT

------------------------------------------------------------

0000220208A656BEEF11B811D1AD5B0060972C

FBA8A656BEEE11B811D1AD5B0060972CFBA8

                                                                                                    

 

SQL> select ename,enumber,deref(edept) from emp;

 

ENAME                                           ENUMBER
----------------------------------------------  --------------------------------

DEREF(EDEPT)(DNAME, ADDRESS)                                                                  

------------------------------------------------------------------

Mike Ault                                       1

DEPT_T('Home', '5055 Forest Run')                                                                  

                                                                                                   

SQL> spool off

Listing 3: Example Use of REF and DEREF

SEE CODE DEPOT FOR FULL SCRIPTS


For more information on this topic, I recommend Don Burleson's latest book "Oracle Tuning: The Definitive Reference". 

You can buy it direct from the publisher for 50%-off and get instant access to the code depot of Oracle tuning scripts:

http://www.rampant-books.com/book_1002_oracle_tuning_definitive_reference_2nd_ed.htm


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