Question

I added some rows into the table manually and also I set up the ID (auto_increment) manually. Now when I try to add new row through my app into DB table, to DB table I am getting the error , that the created ID value already exist.

How can I set manually the next ID value (for example, in table I have to IDs, so how to tell to PostgreSQL, that the next ID should be counted since the number 3)?

Answer 1

http://www.postgresql.org/docs/current/static/functions-sequence.html

select setval('sequence-name', <new-value>);

You can get the sequence name from the the table definition:

id       | integer                | not null default nextval('id_seq'::regclass)

In this case the sequence is named ‘id_seq’

Edit (10x to @Glenn):

SELECT setval('id_seq', max(id)) FROM table;