From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Marcos Pegoraro <marcos(at)f10(dot)com(dot)br> |
Cc: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: update with no changes |
Date: | 2021-11-19 17:22:29 |
Message-ID: | 3085805.1637342549@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Marcos Pegoraro <marcos(at)f10(dot)com(dot)br> writes:
> But it takes resources for other operations, right ?
> I think this is not unusual. If an user double click on a grid, just sees a
> record and clicks ok to save, probably that application calls an update
> instead of seeing if some field were changed before that.
[ shrug... ] As David said, if you think that it's important to have
such a check in a particular application, use a trigger to check it.
There's one built-in, you don't even need an extension:
https://www.postgresql.org/docs/current/functions-trigger.html
We're not going to make that happen by default though, because it'd
be a net drag on better-written applications.
regards, tom lane
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