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From: Greg Sabino Mullane <[email protected]>
To: Adrian Klaver <[email protected]>
Cc: Alban Hertroys <[email protected]>
Cc: yudhi s <[email protected]>
Cc: David G Johnston <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: Insert works but fails for merge
Date: Tue, 13 Aug 2024 09:55:18 -0400
Message-ID: <CAKAnmmK2iECtmatmiOq_JE03K5dFPmugy_CqbGAs-SR-3U1bbw@mail.gmail.com> (raw)
In-Reply-To: <CAKAnmm+UgOUpGeurzeFg6r-q7RwhwuY-rQLd2nhSMk2sFfTJQA@mail.gmail.com>
References: <CAEzWdqc=QKpfFU3jNSoBrZ37y727GK2w2rSQ2qJCEGJDT5Pm6Q@mail.gmail.com>
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I just remembered that one of the complaints was not wanting to worry about
looking up the data types. In my previous example, you can also leave out
the types and Postgres will do the right thing. I prefer the explicit data
type version for clarity, but though I would provide this one for
completeness:

prepare foo as with x as (update tab1 set mid=$2 where id=$1 returning 1)
  insert into tab1 select $1,$2,$3 where not exists (select 1 from x);

Cheers,
Greg


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