Re: ERROR: insufficient columns in the PRIMARY KEY constraint definition - Mailing list pgsql-bugs

Alvaro Herrera <alvherre@2ndquadrant.com> writes:
> On 2020-Sep-29, Tom Lane wrote:
>> Meh.  If you've read that bit you probably already understand that
>> pkeys are unique constraints.  I think the problem is with the error
>> text not the docs.

> Maybe mention PKs in parens:

> "Unique constraints (and[, by extension,] primary key constraints) on
> partitioned tables must include all the partition key columns. This
> limitation exists because PostgreSQL can only enforce uniqueness in each
> partition individually.".

I don't object to clarifying that (and that wording seems fine), but I
think fixing the error message is more important.  We'd not be having this
discussion if the OP had found that documentation.

            regards, tom lane