On Fri, Feb 2, 2018 at 8:49 AM, Nandakumar M <m(dot)nanda92(at)gmail(dot)com> wrote:
> But, for the PK column we are not in control of the index that is created.
>
You probably can (I assume the nulls aspect of the index doesn't prevent
PK usage), but you must add the PK to the table after creating the index
and not let the system auto-generate the index for you.
https://www.postgresql.org/docs/10/static/sql-altertable.html
ALTER TABLE name ADD PRIMARY KEY USING INDEX index_name;
David J.