Re: How to always run UPDATE FROM despite missing records in the source table?

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От Andrew Gierth
Тема Re: How to always run UPDATE FROM despite missing records in the source table?
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Msg-id 87r2dgn8l6.fsf@news-spur.riddles.org.uk
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Ответ на Re: How to always run UPDATE FROM despite missing records in thesource table?  (Alexander Farber <alexander.farber@gmail.com>)
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>>>>> "Alexander" == Alexander Farber <alexander.farber@gmail.com> writes:

 Alexander> even though I wonder what is the (VALUES
 Alexander> ('20.20.20.20'::inet)) v(ip) construct there, some temporary
 Alexander> table which is then LEGT JOINed to the geoip table?

The SQL spec calls it a <table value constructor>. The VALUES clause
behaves like a SELECT that returns a fixed number of rows (1 or more)
whose columns contain the results of the specified expressions. The
v(ip) part is just a table and column alias (I omitted the optional AS
keyword out of long habit) to name the constructed table.

-- 
Andrew (irc:RhodiumToad)


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