Hi Ioana and David.

   Thank you. Yes, I can see the problem. I will look into your suggestions.

 Leif


----- Original Message -----
> On Friday, September 18, 2015, Leif Jensen <l...@crysberg.dk> wrote:
> 
> >    Hello Laurenz,
> >
> >    Thank you for you suggestion. I really want to aviod that someone
> > 'accidentally' deletes too much by typing (programming) a not full
> > qualified DELETE ... statement. In your case one would have to always use
> > the delete function, but no restrictions on using the DELETE statement.
> >
> >
> There is no way you can prevent a superuser from shooting themselves in the
> foot.  For anyone else you can enforce use of the function to perform the
> delete.
> 
> You could make a field called ok-to-delete and add a partial unique index
> on it so that only a single record can be marked ok to delete at a time and
> then have your trigger abort if it tries to delete a field without the ok
> to delete field set to true.
> 
> David J.
> 


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