On 28 February 2017 at 18:03, David G. Johnston <david.g.johns...@gmail.com>
wrote:

> On Tue, Feb 28, 2017 at 9:50 AM, Ivan Voras <ivo...@gmail.com> wrote:
>
>>
>> ivoras=# alter table foo alter constraint "foo_a_b_key" deferrable;
>> ERROR:  constraint "foo_a_b_key" of relation "foo" is not a foreign key
>> constraint
>>
>>
> ​A more clear error message would be:
>
> EROR:  cannot alter non-foreign key constraint "foo_a_b_key"​ of relation
> "foo"
>
> Though I'm not sure how that meshes with the error message style guides...
>


Any idea what underlying technical reason prohibits marking non-fk
constraints as deferrable?

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