Re: [PATCH] Support for Array ELEMENT Foreign Keys

Claudio Freire <klaussfreire@gmail.com> writes:
> What about something more generic?

> CREATE TABLE <tname> ( <cname> <type> [(<expr>)] REFERENCES <t2name>
> [(<t2expr>)] )

> Meaning, if <expr> is missing, it's taken <expr> = <cname>, if not,
> it's the result of that expression the one that references the target
> table.

Doesn't seem terribly sensible as a column constraint: a column
constraint ought to just be on the current column.  If you want
something more generic, the table-constraint syntax would be the
place for it ... but that's not where we have a syntax problem.

			regards, tom lane