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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