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From: Laurenz Albe <[email protected]>
To: Erik Wienhold <[email protected]>
To: Laura Smith <[email protected]>
Cc: postgre <[email protected]>
Subject: Re: How to update upper-bound of tstzrange ?
Date: Tue, 21 May 2024 12:02:56 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <dwdB2YsSerbqrnxCL0GdRg7C61LmqBs4V-7-qC7t9sAq7_MY6Y76tQ4rhwHKbvJRr-6We87i_r0KHwDaf3yoxBbld1-62IPNoiZ3rtBGW8Q=@protonmail.ch>
	<[email protected]>

On Mon, 2024-05-20 at 13:56 +0200, Erik Wienhold wrote:
> On 2024-05-20 12:30 +0200, Laura Smith wrote:
> > Could someone kindly help me out with the correct syntax ?
> > 
> > My first thought was the below but that doesn't work:
> > 
> > update foo set upper(bar_times)=upper(bar_times)+interval '1' hour where bar_id='abc';
> > ERROR:  syntax error at or near "("
> > LINE 1: update event_sessions set upper(bar_times)=upper(bar_ti...
> 
> Use the constructor function:
> 
>     UPDATE foo SET bar_times = tstzrange(lower(bar_times), upper(bar_times) + interval '1' hour);
> 
> But this does not preserve the inclusivity/exclusivity of bounds from
> the input range, so you may have to pass in the third argument as well.
> 
> https://www.postgresql.org/docs/current/rangetypes.html#RANGETYPES-CONSTRUCT

If you need to preserve the information whether the upper and lower bounds
are inclusive or not, you could

  UPDATE foo
  SET bar_times = tstzrange(
                     lower(bar_times),
                     upper (bar_times) + INTERVAL '1 hour',
                     CASE WHEN lower_inc(bar_times) THEN '[' ELSE '(' END ||
                     CASE WHEN upper_inc(bar_times) THEN ']' ELSE ')' END
                  )
  WHERE ...

Yours,
Laurenz Albe

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