RE: Insert data if it is not existing

From the docs:
“ON CONFLICT can be used to specify an alternative action to raising a unique constraint or exclusion constraint violation error.”

So if the INSERT part succeeds then the ON CONFLICT part is never executed.
If the INSERT fails with due to a violation of the constraint you specified (or was implied) then the ON CONFLICT part is executed instead. An UPDATE here can raise further errors, of course.
If the INSERT fails for a different reason then the ON CONFLICT part is not executed.

Steve.

From: tango ward [mailto:tangoward15(at)gmail(dot)com]
Sent: 23 May 2018 10:46
To: Steven Winfield
Cc: pgsql-generallists.postgresql.org
Subject: Re: Insert data if it is not existing

thanks for the response Steven.

Will ON CONFLICT DO UPDATE/NOTHING if there's no error?

On Wed, May 23, 2018 at 5:43 PM, Steven Winfield <Steven(dot)Winfield(at)cantabcapital(dot)com<mailto:Steven(dot)Winfield(at)cantabcapital(dot)com>> wrote:
INSERT … ON CONFLICT DO UPDATE … is probably what you want, perhaps using a specified unique index/constraint:
https://www.postgresql.org/docs/10/static/sql-insert.html#SQL-ON-CONFLICT<https://www.postgresql.org/docs/10/static/sql-insert.html#SQL-ON-CONFLICT>

Steve.

From: tango ward [mailto:tangoward15(at)gmail(dot)com<mailto:tangoward15(at)gmail(dot)com>]
Sent: 23 May 2018 10:04
To: pgsql-generallists.postgresql.org<http://pgsql-generallists.postgresql.org>
Subject: Insert data if it is not existing

Hi,

I just want to ask if it's possible to insert data if it's not existing yet. I was able to play around with UPSERT before but that was when there was an error for duplicate data. In my scenario, no error message is showing.

Any suggestion?

Thanks,
J

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