On Tue, 2010-10-26 at 20:25 +0300, Peter Eisentraut wrote:
> Let's say you have
>
> PK
>
> 1
> 2
> 3
> 4
> 5
>
> FK
>
> [1,2,3]
> [3,4,5]
> [4,4,4]
>
> When you delete PK = 3, what do you expect to happen? OK, you might
> decide to delete the first two rows from the FK table. This might or
> might not make sense in a particular case, but on delete cascade is an
> option the user has to choose explicitly.
That's what I would expect.
> But I don't see what to do
> about cascading an update when you, say, update PK 1 => 6.
Intuitively, I would expect all 1's to be replaced by 6's in all arrays.
But I can now see why you would be hesitant to try to support that.
Regards,
Jeff Davis
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