On 7 April 2016 at 14:48, Merlin Moncure <mmonc...@gmail.com> wrote:
>
> On Thu, Apr 7, 2016 at 4:39 AM, postgres_sure <postgres_s...@163.com> wrote:
> > Hi,
> >
> > I found "Do not include the table's name in the specification of a target
> > column
> > — for example, UPDATE tab SET tab.col = 1 is invalid." in
> > the documentation.
> >
> > Some people usually like to update table by alias. They want to add this
> > feature.
>
> Is this syntax described in the SQL standard?
Given that the SQL standard has no concept of UPDATEs against a query
with multiple tables, and that's where this could bring the most
clarity, I'm not sure that it's reasonable to object on that basis.
As far as I can see the SQL standard doesn't let you alias tables in
an UPDATE (for the same reason, I imagine) but we allow _that_ even in
a single-table UPDATE.
<update statement: positioned> ::=
UPDATE <table name>
SET <set clause list>
WHERE CURRENT OF <cursor name>
Geoff
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