public inbox for [email protected]  

help / color / mirror / Atom feed

From: Adrian Klaver <[email protected]>
To: Rich Shepard <[email protected]>
To: [email protected]
Subject: Re: Convert date and time colums to datetime
Date: Sun, 19 Oct 2025 09:59:39 -0700
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<[email protected]>

On 10/19/25 09:35, Rich Shepard wrote:
> On Sun, 19 Oct 2025, Adrian Klaver wrote:
> 
>> 2) If you really need a timestamp the work is already done, instead of 
>> building on the fly.
> 
> Adrian,
> 
> As each row in the table already has both a date column and a time column I
> don't know if I 'really' need a timestamp. When would a timestamp be really
> needed?

I would say the fact you are asking is an indication you might need it.

> 
>> select ('10/19/2025'::date + '07:50'::time)::timestamptz;
> 
> Yes, I saw that on the doc page. This requires manually changing each 
> row in
> the table rather than using a date/time condition/function to to create the
> single timestamp column. So, apparently there's not a way to modify the
> table other than by hand.

1) Again you seem to be establishing a need for combined value.

2) Not sure how you  do "...date/time condition/function to to create 
the single timestamp column" without creating a column?

If you meant creating a timestamp value then I point you at my original 
post and:

"2) If you really need a timestamp the work is already done, instead of 
building on the fly."

Doing the one time change to add a timestamp field to the table and then 
do the UPDATE of date + time to populate it versus calculating it every 
time you need the value. Of course moving forward you would need to 
change the code that INSERTs new values to use a timestamp instead of a 
date and a time value.

> 
> Thanks,
> 
> Rich
> 
> 


-- 
Adrian Klaver
[email protected]

view thread (6+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected]
  Subject: Re: Convert date and time colums to datetime
  In-Reply-To: <[email protected]>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox