Re: Cannot insert a duplicate key into unique index

<kynn@panix.com> writes:
> The insert statement that is producing this error does not
> include a value for the pkey field in question (this field is of type
> SERIAL).  I imagine that somehow the counter associated with this
> field got messed up, so that it is mistakenly generating a value that
> has been used already.  How can I straighten it out?

You need to do something like

    select setval('seq-name', (select max(col) + 1 from table));

            regards, tom lane