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Home -> Community -> Mailing Lists -> Oracle-L -> RE: PL/SQL Question:Eliminate duplicate rows
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;
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;
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: 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 servicesto: 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 Fri Sep 19 2003 - 15:09:39 CDT
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