How Do I Reset a Postgres Auto-Increment Counter?

Resetting PostgreSQL Auto-Increment Sequences

PostgreSQL doesn't use AUTO_INCREMENT like MySQL. Instead, it uses sequences to manage auto-incrementing values. To reset a sequence's starting value, you need to identify the sequence name associated with your table's auto-incrementing column.

Attempting to use ALTER TABLE product AUTO_INCREMENT = 1453 will fail because PostgreSQL doesn't recognize this syntax. The error "relation 'product' does not exist" is common.

The sequence name typically follows the pattern ${table_name}_${column_name}_seq. For a table named "product" with an "Id" column, the sequence would be "product_id_seq".

The correct command to reset the sequence to start at 1453 is:

ALTER SEQUENCE product_id_seq RESTART WITH 1453;

To find the correct sequence name, use the d command in the psql command-line tool. For example, d product will show the table definition, including the sequence name used by any auto-incrementing columns (via a default constraint). Alternatively, you can use a query like SELECT pg_catalog.pg_get_serial_sequence('product', 'id'); to retrieve the sequence name directly.

The above is the detailed content of How Do I Reset a Postgres Auto-Increment Counter?. For more information, please follow other related articles on the PHP Chinese website!