On Fri, 17 Jun 2016 10:56:32 +0200
Rapin Patrick <rapin.patr...@gmail.com> wrote:

> And my C++ wrapper then knows that this column is a speed expressed
> in meters per second. So when making a SELECT on t1 table, the
> wrapper will output number objects with unit dimension of Speed
> expressed in m/s !

You are encoding type information in the name.  If you move the type
information into the data, SQLite can manage the unit dimension.  You
could use a CHECK constraint to require that speed was in m/s, or a
trigger to make it so.  

--jkl

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