Help with updating a column value

Question

I have a table
create table library_Test
CLIENTID NUMBER (11),
PROPERTYID NUMBER (11),
DOCID NUMBER (2),
DATECREATED DATE
Insert into library_test values(99999,12345,1,sysdate)
Insert into library_test values(88888,45678,2,sysdate)
Now I add in a column libraryid which will identity each row
alter table library_test add libraryid number(11)
Now I want to generate libraryIDs say 1,2 and so on for the number of rows in the table. I want libraryid as 1 for the first record created
based on datecreated.
So I want my output to look like this
clientid propertyid docid datecreated libraryid
99999 12345 1 6/26/2007 2:04:30 PM 1
88888 45678 2 6/26/2007 2:04:56 PM 2
Can this be possible to do. If its not possible based on datecreated, how do I insert ids into this table so it will have a uniqueness to a row.
Oracle version is 9.2.0.1.0
Any help is appreciated.
Thanks,
Priya.

Answer 1

SQL> select * FROM library_Test;
  CLIENTID PROPERTYID      DOCID DATECREAT  LIBRARYID
     99999      12345          1 28-JUN-07
     88888      45678          2 28-JUN-07
SQL> update library_Test aa set aa.libraryid =
  2  (select rn from (select CLIENTID,PROPERTYID,row_number() over (partition by trunc(DATECREATED) order by DATECREATED) rn from library_Test)
  3  where CLIENTID = aa.CLIENTID and PROPERTYID = aa.PROPERTYID);
2 rows updated.
SQL> commit;
Commit complete.
SQL> select * FROM library_Test;
  CLIENTID PROPERTYID      DOCID DATECREAT  LIBRARYID
     99999      12345          1 28-JUN-07          1
     88888      45678          2 28-JUN-07          2
SQL>