On Tue, 25 Feb 2020 12:02:24 -0500
Przemek Klosowski <przemek.klosowski+sql...@gmail.com> wrote:

> and I want to avoid storing repetitive data, so that the database
> should contain 
> 10:32  12
> 10:35  15
> 10:39  13
> 10:46  18
> where only the earliest time with the unchanging value is stored.

Be careful what you wish for.  Usually "avoid storing" is a proxy for
some kind of intended use.  Unless it's infeasible, it's usually better
to store everything, verbatim, as it arrives.  Then you can present it
however you like, with nothing lost.  

--jkl
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