Re: Why is UPDATE with column-list syntax not implemented

AK wrote
> 9.3 documentation says:
>
> According to the standard, the column-list syntax should allow a list of
> columns to be assigned from a single row-valued expression, such as a
> sub-select:
>
> UPDATE accounts SET (contact_last_name, contact_first_name) =
>     (SELECT last_name, first_name FROM salesmen
>      WHERE salesmen.id = accounts.sales_id);
> This is not currently implemented — the source must be a list of
> independent expressions.
>
> Why is this not implemented? Is it considered inconvenient to use, or
> difficult to implement. or not important enough, or some other reason?

I cannot answer why but I too would like to see this.  I actually asked this
a long while back but cannot seem to find my posting or recall the response.

David J.




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