From: | AK <alkuzo(at)gmail(dot)com> |
---|---|
To: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Why is UPDATE with column-list syntax not implemented |
Date: | 2013-11-21 18:28:33 |
Message-ID: | 1385058513821-5779600.post@n5.nabble.com |
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Thread: | |
Lists: | pgsql-hackers |
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?
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