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How to fix error duplicate key value violates unique constraint?
Suppress “duplicate key value violates unique constraint” errors
- Suppress the log, either by suppressing all logs about this key, or perhaps by specifying something on the transaction that tries to do the INSERT .
- Use some other Postgres feature to spot the duplicate key and not try the INSERT .
How do you solve duplicate key value violates unique constraint in postgresql?
Back up your PG database (just in case), then run this command: SELECT setval(‘the_primary_key_sequence’, (SELECT MAX(the_primary_key) FROM the_table)+1); That will set the sequence to the next available value that’s higher than any existing primary key in the sequence.
What is unique index in Postgres?
PostgreSQL automatically creates a unique index when a unique constraint or primary key is defined for a table. The index covers the columns that make up the primary key or unique constraint (a multicolumn index, if appropriate), and is the mechanism that enforces the constraint.
What is duplicate key exception?
The DuplicateKeyException exception is thrown if an entity EJB object or EJB local object cannot be created because an object with the same key already exists. This exception is thrown by the create methods defined in an entity bean’s home or local home interface.
Why do I get a duplicate key error in PostgreSQL?
If you get this message when trying to insert data into a PostgreSQL database: ERROR: duplicate key violates unique constraint That likely means that the primary key sequence in the table you’re working with has somehow become out of sync, likely because of a mass import process (or something along those lines).
What does duplicate key violate the unique constraint?
ERROR: duplicate key violates unique constraint That likely means that the primary key sequence in the table you’re working with has somehow become out of sync, likely because of a mass import process (or something along those lines).
Is it necessary to add a unique constraint to PostgreSQL?
Adding another unique constraint isn’t necessary to do that. The “duplicate key” error is telling you that the work was not done because it would produce a duplicate key, not that it discovered a duplicate key already commited to the table. From http://www.postgresql.org/docs/current/interactive/datatype.html.
When do you get unique violation in PostgreSQL?
So, if, for example, you imported 10 users, you have users with ids 1-10, but your sequence is still at 1. When you attempt to create a new user without specifying the id, it pulls the value from the sequence (1), and you get a unique violation because you already have a user with id 1.