duplicate key value violates unique constraint
Correcting the ERROR error: duplicate key value violates unique constraint.
The problem occurs when migrating / importing data. PostgreSQL stops understanding columns and wants to create another value to the unique column.
Let’s find the maximum number according to PostgreSQL:
SELECT MAX (id) FROM categories_done;
SELECT nextval (‘categories_id_seq’);
Let’s reset the counter:
SELECT setval (‘categories_id_seq’, (SELECT MAX (id) FROM categories) +1);
