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From: Peter J. Holzer <[email protected]>
To: [email protected]
Subject: Re: Convert date and time colums to datetime
Date: Mon, 20 Oct 2025 13:05:38 +0200
Message-ID: <3cq7x5ky2pn2jabsx7bg67b4c34aijnhxc5ewpgmfot73vftd5@pjlqjnh47ymt> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>

On 2025-10-19 20:32:07 -0600, Rob Sargent wrote:
> > On Oct 19, 2025, at 2:38 PM, Rich Shepard <[email protected]> wrote:
> > On Sun, 19 Oct 2025, Rob Sargent wrote:
> >> I think you have to ask why those values were separated in the first
> >> place. For instance if they are thought of as a pair in most queries then
> >> an alteration might be in order. There can be a large one time cost if
> >> these tables occur in a lot of separate sql calls in the business logic.
> > 
> > Good point. They're in the contacts table and I use them to determine when
> > to make another contact and if prior contacts were more productive in the
> > morning or afternoon.
> 
> Definitely a datetime (single value) problem, imho

Actually, to me that seems to be one of the few cases where splitting
them makes sense. I would expect typical updates to be something like
"sane time, but 6 months later" or "same day, but different time". There
might also be constraints like "not before 9am". For queries there might
be stuff like "who do I need to call today", or as Rich already
mentioned, statistics by time of the day. There are probably relatively
few queries where you need to treat date and time as a unit.

        hjp

-- 
   _  | Peter J. Holzer    | Story must make more sense than reality.
|_|_) |                    |
| |   | [email protected]         |    -- Charles Stross, "Creative writing
__/   | http://www.hjp.at/ |       challenge!"


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