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RE: PL/SQL Question:Eliminate duplicate rows

From: Mercadante, Thomas F <NDATFM_at_labor.state.ny.us>
Date: Mon, 22 Sep 2003 05:19:45 -0800
Message-ID: <F001.005D0B2E.20030922051945@fatcity.com> 





Ron,



Doesn't matter.  On the way to your car, or the gym, or to watch your kids
play ball - my Uncle Guido can find you anywhere you go!!  :)



Tom Mercadante


Oracle Certified Professional




-----Original Message-----



Sent: Friday, September 19, 2003 5:20 PM
To: Multiple recipients of list ORACLE-L





Hi Tom-



Submitting to a listserve is like living in a small town.  Make 1 little
oops and everybody knows


about it.



Do I need to look over my shoulder on the way to my car tonight???  ;)



Ron Thomas


Hypercom, Inc


rthomas_at_hypercom.com


Each new user of a new system uncovers a new class of bugs. -- Kernighan


 


                      NDATFM_at_labor.stat

                      e.ny.us                  To:


ORACLE-L_at_fatcity.com


                      Sent by:                 cc:

                      ml-errors_at_fatcity        Subject:  RE: PL/SQL


Question:Eliminate duplicate rows


                      .com

 

 

                      09/19/2003 02:29

                      PM

                      Please respond to

                      ORACLE-L

 

 









You know, I never use that exception, so I can't remember it correctly.



You are correct, of course - thanks for embarrasing me in front of thousands
and thousands and thousands  (how many Jared??) of people!  :)



Tom Mercadante


Oracle Certified Professional




-----Original Message-----



Sent: Friday, September 19, 2003 4:10 PM
To: Multiple recipients of list ORACLE-L





except your too_many_rows exception should be dup_val_on_index...



Ron Thomas


Hypercom, Inc


rthomas_at_hypercom.com


Each new user of a new system uncovers a new class of bugs. -- Kernighan





                      NDATFM_at_labor.stat

                      e.ny.us                  To:


ORACLE-L_at_fatcity.com


                      Sent by:                 cc:

                      ml-errors_at_fatcity        Subject:  RE: PL/SQL


Question:Eliminate duplicate rows


                      .com





                      09/19/2003 01:54

                      PM

                      Please respond to

                      ORACLE-L













Johann,



how about the following.  what this does is, using the inner begin/end
block, catches when an insert would fail because of the PK failure and
ignores the error.



This is very quick and dirty - it will work fine if you are not working with
a huge amount of data.



declare



cursor c1 is


  select col1, col2


   from some_table;


begin


 for c1_rec in c1 loop


  begin


    insert into new_table(col1, col2)


      values (c1_rec.col1, c1_rec.col2);
    exception

      when too_many_rows then
           null;




  end;


 end loop;


end;


/



If you are talking about lots and lots of data, you could easily query the
table you are inserting into, testing for the existence of the value you are
attempting to insert.  If you find it, skip the insert.  Like this:



declare


rec_count number;


cursor c1 is


  select col1, col2


   from some_table;


begin


 for c1_rec in c1 loop


  begin


    select count(*)

     into rec_count
     from new_table
     where col1 = c1_rec.col1;  -- this assumes that col1 is the pk!
     if rec_count = 0 then
       insert into new_table(col1, col2)
        values (c1_rec.col1, c1_rec.col2);
     end if;
    exception
      when too_many_rows then
           null;




  end;


 end loop;


end;


/



Good Luck!



Tom Mercadante


Oracle Certified Professional




-----Original Message-----



Sent: Friday, September 19, 2003 3:05 PM
To: Multiple recipients of list ORACLE-L




Looking for an a sample cursor routine to load a PK enabled table to
eliminate


any dupes from the load table.





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Author: Mercadante, Thomas F


  INET: NDATFM_at_labor.state.ny.us


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Author: Ron Thomas


  INET: rthomas_at_hypercom.com


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Author: Mercadante, Thomas F


  INET: NDATFM_at_labor.state.ny.us


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San Diego, California        -- Mailing list and web hosting services


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Author: Ron Thomas


  INET: rthomas_at_hypercom.com


Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services


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-- 



Author: Mercadante, Thomas F


  INET: NDATFM_at_labor.state.ny.us


Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services


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To REMOVE yourself from this mailing list, send an E-Mail message


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Received on Mon Sep 22 2003 - 08:19:45 CDT












Original text of this message













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