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Why is it saying "unique constraint violated"?

Posted on 2009-05-19
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Last Modified: 2013-12-07
I am copying a table from one database to another i.e. ACCOUNTING.EXPENSES to FINANCING.EXPENSES
I want to maintain the primary keys (column 'ID') so I have my triggers off. However when I proceed to copy my tables it kept saying 'unique constraint violated' on the primary keys.

I don't know what's wrong with it. Pls help. Thanks.
INSERT INTO FINANCING.EXPENSES (ID, EMPLOYEE_ID, AMOUNT, DATE_ENTERED, DESCRIPTION, ACTUAL_INVOICE_RATE)
SELECT ID, EMPLOYEEID, AMOUNT, DATE, COMMENTS, RATE
FROM ACCOUNTING.EXPENSES 
WHERE EMPLOYEEID = 12345;

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Question by:Corinne_09
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LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24426626
as the error message says: the primary key constraint is violated by the existing + inserted data.
means that either you copy duplicated key values, OR at least 1 row of the inserted data has a primary key value that is already in the destination table.

to solve, you need to either use the MERGE statement, or put a LEFT JOIN + WHERE to discard the rows that are already present, and eventually add a UPDATE statement (best before the insert) to do the updates, if needed (=> or as said, use the MERGE statement instead):
http://www.psoug.org/reference/OLD/merge.html
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Author Comment

by:Corinne_09
ID: 24426658
The reason why I'm asking this question is because FINANCING.EXPENSES is an empty table, so there is no way the PK constraint is being violated if I'm just inserting new values. Also, both FINANCING.EXPENSES and ACCOUNTING.EXPENSES have a PK constraint enabled, so I don't understand why there would be duplicated keys in ACCOUNTING.EXPENSES in the first place.
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Accepted Solution

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Guy Hengel [angelIII / a3] earned 500 total points
ID: 24426702
>so there is no way the PK constraint is being violated if I'm just inserting new values.
yes, if the inserted data itself contains duplicate values
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Expert Comment

by:Huseyin KAHRAMAN
ID: 24432588
or there are triggers on the inserted table doing some  other inserts to other tables which creates problem... did you check FINANCING.EXPENSES? maybe there are some active insert triggers...

or run this query to see whether the query returns duplicate data
SELECT   ID, COUNT (*) rec_count
    FROM accounting.expenses
   -- WHERE employeeid = 12345 -- remove comment to see all duplicate data
GROUP BY ID
  HAVING COUNT (*) > 1;

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Author Closing Comment

by:Corinne_09
ID: 31583240
All the primary keys are unique and all triggers were disabled. There was an issue with case-insensitive data so any difference in lowercase and uppercase values were treated differently, thus causing duplicate values.
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