Re: Changing a table column datatype

<marshall@perilith.com> writes:
> Hmmm...  Maybe I haven't explained what I'm trying to do clearly.
> I don't wish to insert new fqdn values into this table, only copy
> the contents of one column (`mycol') into another column (`mycol_new').
> Am I missing something here?

Yes.  You should be using UPDATE not INSERT, viz

    UPDATE mytable SET mycol_new = mycol;

INSERT is for adding new rows.

            regards, tom lane