Re: duplicate key value violates unique constraint

On Sat, Mar 7, 2020 at 12:35 PM Ashkar Dev <ashkardev(at)gmail(dot)com> wrote:

>
> Hi all,
>
> how to fix a problem, suppose there is a table with id and username
>

You should probably provide the definition though in this case it is
self-evident that you are using bigserial.

> So it doesn't start again from non-available id 1, so what is needed to do
> to make the new inserts go into non-available id numbers?
>

Alter sequence

https://www.postgresql.org/docs/12/sql-altersequence.html

> and if the id reaches the limit and maybe there is some ids that are not
> used.
>

This is highly unlikely.

Is the subject line supposed to relate to this in some way?

You should not worry about any of this in production; and frankly, worrying
about it in development is largely pointless as well.

There is no actual problem here to be fixed.

David J.