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Message Posted: Mon, 29 Oct 2007 @ 15:49:13 GMT


     
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Subj:   Generate unique id
 
From:   Soumya Smita

Hi,

I have a table with fields acct_id, fd1, fd2, fd3.

I want a unique id generated for each unique combination of fd1, fd2, fd3. Acct_id is not considered for generating the unique id. I have millions of rows in my table, hence when I was using sum() over ....., I was getting spool space error.(May be due to sorting on the huge no. of rows involved.)

Plz let me know the best approach to get a unique_id , need not be based on any sorting criterion, considering that there are millions of rows in the table.

Desired unique_id's somethng like this:

     acct_id      fd1   fd2    fd3  uniq_id
     100          a     b      c     1
     200          a     b      c     1
     300          a     b      b     2
     400          a     a      b     3

Just that uniq_id should not take acct_id in consideration... and query should avoid sort on the rows.(Neways there is no desired sequence for the unique_ids)


Thanks!!!



     
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