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

From David Johnston
Subject Re: Why is UPDATE with column-list syntax not implemented
Date
Msg-id 1385059832153-5779601.post@n5.nabble.com
Whole thread Raw
Responses Re: Why is UPDATE with column-list syntax not implemented  (Claudio Freire <klaussfreire@gmail.com>)
List pgsql-hackers
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.




--
View this message in context:
http://postgresql.1045698.n5.nabble.com/Why-is-UPDATE-with-column-list-syntax-not-implemented-tp5779600p5779601.html
Sent from the PostgreSQL - hackers mailing list archive at Nabble.com.



pgsql-hackers by date:

Previous
From: Josh Berkus
Date:
Subject: Re: additional json functionality
Next
From: Claudio Freire
Date:
Subject: Re: Why is UPDATE with column-list syntax not implemented