ORA-00001 unique constraint violated - solution commands

The ORA-00001: unique constraint violated error in Oracle Database occurs when you attempt to insert or update a record that would create a duplicate value in a column or set of columns that are defined with a unique constraint. To resolve this error, 

follow these steps

1. Identify the Unique Constraint

First, determine which unique constraint is being violated. You can use the following SQL query to find out:

SELECT constraint_name, table_name
FROM user_constraints
WHERE constraint_type = 'U';

2. Check for Duplicate Values

Next, identify the existing values that are causing the violation. You can run a query to check for duplicates in the relevant column(s):

SELECT column_name, COUNT(*)
FROM your_table_name
GROUP BY column_name
HAVING COUNT(*) > 1;

3. Resolve the Conflict

Depending on your findings, you have several options:

Modify the Insert or Update Statement: Ensure that the data you are trying to insert or update does not already exist in the table. You might want to use a different value that does not violate the constraint.

Delete or Update Existing Records: If you find that duplicate records exist that should not be there, you might need to delete or update those records:

-- To delete duplicates

DELETE FROM your_table_name
WHERE condition; -- Specify the condition to identify the duplicate record

-- To update duplicates

UPDATE your_table_name
SET column_name = new_value
WHERE condition; -- Specify the condition to identify the record to be updated

Change the Unique Constraint: If you find that the unique constraint is no longer applicable, you may consider dropping or altering it, but be cautious as this may lead to data integrity issues.

ALTER TABLE your_table_name
DROP CONSTRAINT constraint_name;

4. Retry the Operation

After resolving the issue, you can attempt your insert or update operation again.