"M.D.G. Lange" <[EMAIL PROTECTED]> writes:
> No matter what ON DELETE constraint I created, the system will not allow 
> me to create a foreign key, as pg_shadow is a system catalog.

We do not support foreign keys (or indeed triggers of any kind) on
system catalogs.  I don't foresee that happening in the near future
either, though I think there is something about it on the TODO list.

                        regards, tom lane

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