Mutating Problem when insert while selecting data from dual

Hi All,
we have a table
test (
ID NUMBER
NAME VARCHAR2(100)) and a before insert trigger
create or replace trigger test1
before insert on test
for each row
begin
select decode(max(id),null,1,max(id)+1) into :new.id from test;
end;
i am able to insert values by using
"insert into test(name) values('test1')" with out any issues.
when i am inserting the values
"insert into test(name) select 'test1' from dual" i am getting error
ORA-04091: table SCOTT.TEST is mutating, trigger/function may not see it
Could someone please advice why i am getting error in second scenario.
Thanks in Advance
Prasad

Prasad
try
insert into test (name) values ((select 'test1' from dual));
Frank

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[http://www.quickfilepost.com/download.do?get=c974356a498b3a4d369aa0c50622e50b]
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Eliminate duplicate while fetching data from source

Hi All,
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100 12345 01-jan-2009 CREDIT
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while fetching data for jan-2009, it will get cust_id 12345 and will fetch all 3 records and load it into target.
while fetching data for jan-2010, it will get cust_id 12345 and will fetch all 3 records and load in into target.
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I want to eliminate it while fetching data from source.
Edited by: ace_friends22 on Apr 6, 2011 10:16 AM

You can do it this way....
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FROM customer_transaction
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 AND transaction_date < ADD_MONTHS(SYSDATE, -119)However please note that - if want to get the transaction in a month like what you said earlier jan-2009 and jan-2010 and so on... you might need to use TRUNC...
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INSERT INTO customer_transaction VALUES (100,12345,TO_DATE('01-JAN-2009','dd-MON-yyyy'),'CREDIT');
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INSERT INTO customer_transaction VALUES (100,12345,TO_DATE('01-JAN-2010','dd-MON-yyyy'),'DEBIT');
INSERT INTO customer_transaction VALUES (100,12345,TO_DATE('01-JAN-2000','dd-MON-yyyy'),'DEBIT');
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 SET transaction_date = TO_DATE('02-JAN-2009','dd-MON-yyyy')
WHERE cut_id = 12345
 AND transaction_date = TO_DATE('01-JAN-2010','dd-MON-yyyy');
UPDATE customer_transaction
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WHERE cut_id = 12345
 AND transaction_date = TO_DATE('01-JAN-2000','dd-MON-yyyy');
commit;
--End of sample data
SELECT *
FROM customer_transaction
WHERE transaction_date BETWEEN ADD_MONTHS(TRUNC(SYSDATE,'MONTH'), -27) AND LAST_DAY(ADD_MONTHS(TRUNC(SYSDATE,'MONTH'), -27));Results....
CUST_LOC CUT_ID TRANSACTI TRANSACTION_TYPE
 100 12345 01-JAN-09 CREDIT
 100 12345 02-JAN-09 DEBIT
 100 12345 03-JAN-09 DEBITAs you can see, there are only 3 records for 12345
Regards,
Rakesh
Edited by: Rakesh on Apr 6, 2011 11:48 AM

Mutating Problem when insert while selecting data from dual

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