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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
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Author: Ron Thomas
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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
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
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Mon Sep 22 2003 - 08:19:45 CDT

Original text of this message

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