To reset the sequence in PostgreSQL and fill the ID column with new data, you can use a series of SQL statements:
- Disable Triggers:
ALTER TABLE table_name DISABLE TRIGGER ALL;
- Restart Sequence:
ALTER SEQUENCE sequence_name RESTART WITH 1;
- Update ID Column:
UPDATE table_name SET id = nextval('sequence_name');
- Enable Triggers:
ALTER TABLE table_name ENABLE TRIGGER ALL;
This approach ensures that the sequence is reset and the ID column is updated with new, sequential values while preserving the order of existing rows.
Alternatively, if you don't need to retain the ordering of IDs, you can use a simpler method:
- Restart Sequence:
ALTER SEQUENCE sequence_name RESTART WITH 1;
- Update ID Column:
UPDATE table_name SET id = nextval('sequence_name');
This method will also reset the sequence and update the ID column with new values, but it will not preserve the order of the rows.