From: | Kevin Grittner <kgrittn(at)ymail(dot)com> |
---|---|
To: | Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Peter Geoghegan <pg(at)heroku(dot)com> |
Cc: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, Craig Ringer <craig(at)2ndquadrant(dot)com>, Anssi Kääriäinen <anssi(dot)kaariainen(at)thl(dot)fi>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Andres Freund <andres(at)2ndquadrant(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: INSERT ... ON CONFLICT {UPDATE | IGNORE} |
Date: | 2014-12-18 15:46:19 |
Message-ID: | 1834320693.491047.1418917579166.JavaMail.yahoo@jws100174.mail.ne1.yahoo.com |
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Lists: | pgsql-hackers |
Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> wrote:
> INSERT INTO persons (username, real_name, data)
> VALUES('foobar', 'foo bar')
> ON CONFLICT (username), (real_name) IGNORE;
> INSERT INTO persons (username, real_name, data)
> VALUES('foobar', 'foo bar')
> ON CONFLICT (username) IGNORE
> ON CONFLICT (real_name) UPDATE ...;
> INSERT INTO persons (username, real_name, data)
> VALUES('foobar', 'foo bar')
> ON CONFLICT (username, real_name) IGNORE
> ON CONFLICT (real_name) UPDATE username = excluded.username;
> ON CONFLICT (username) UPDATE real_name = excluded.real_name;
I like all of these suggestions, except that I think they reflect a
couple things about the syntax which was never settled[1]. First,
Robert suggested using DUPLICATE instead of CONFLICT, which I think
it clearer. So the above would become:
INSERT INTO persons (username, real_name, data)
VALUES('foobar', 'foo bar')
ON DUPLICATE (username), (real_name) IGNORE;
INSERT INTO persons (username, real_name, data)
VALUES('foobar', 'foo bar')
ON DUPLICATE (username) IGNORE
ON DUPLICATE (real_name) UPDATE ...;
INSERT INTO persons (username, real_name, data)
VALUES('foobar', 'foo bar')
ON DUPLICATE (username, real_name) IGNORE
ON DUPLICATE (real_name) UPDATE username = excluded.username;
ON DUPLICATE (username) UPDATE real_name = excluded.real_name;
Second, he suggested a shorthand way of specifying that all the
values from the failed INSERT should be used for the UPDATE:
INSERT INTO persons (username, real_name, data)
VALUES('foobar', 'foo bar', 'baz')
ON DUPLICATE (username) UPDATE;
I think the first point got lost in the discussion of the second
one.
I don't think either point was ever really settled beyond Robert
and I preferring ON DUPLICATE versus Peter preferring ON CONFLICT.
--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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