Tom Lane wrote:
> Andres Freund <andres@anarazel.de> writes:
> > On 2015-04-01 12:46:05 -0400, Robert Haas wrote:
> >> So, the idea is that INSTEAD OF would behave like BEFORE but the tuple
> >> it returns wouldn't actually be inserted? That wasn't clear to me
> >> from the OP, but I guess it would be a reasonable way to go.
>
> > I'm not sure what the OP intended, but to me that's pretty much the only
> > reasonable definition of INSTEAD OF for tables that I can think of.
>
> If you have such a trigger, it's impossible to insert any rows, which
> means the table doesn't need storage, which means it may as well be a
> view, no?
The interesting difference, as per upthread, is that you can have child
tables (partitions) and don't need a defining query but instead have a
defined set of named and typed columns.
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Álvaro Herrera http://www.2ndQuadrant.com/
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