Re: [libreoffice-users] Calculating the difference between two time values by means of SQL

Howdy,

The salient point here is the version of HSQLdb which comes with
LibreOffice is rather old and lacking when it comes to date
manipulation, but it can be done and hopefully this post over at ASK
dot LibreOfffice will help answer you question:
 
https://ask.libreoffice.org/en/question/75480/how-to-do-basic-arithmatic-with-dates-in-libre-base-queries/

best wishes,

Drew

On Thu, Mar 4, 2021 at 9:04 AM Markus Elfring <Markus.Elfring@web.de> wrote:
> Hello,
>
> Two columns of a table (for the database engine “HyperSQL” within the application
> “LibreOffice Base 7.1.0.3-985.1”) have got the data type “TIME”.
> I would like to compute a difference for these fields.
>
> It seems that the following SQL statement is insufficient so far.
>
> SELECT ID, t1, t2, t2 - t1 AS duration FROM time_measurements1
>
>
> I would appreciate your advices.
>
> Would you like to point further information sources out besides query examples
> which work with dates and time stamps?
>
> Regards,
> Markus
>
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