> 
> OK, there is no requirement, but there is a wish to return a stable
> sorting outcome.

Just add an 'order by' clause.

> Please note that the SQL standard does not prohibid stable sorting
> outcome.

It does prohibit it. It states the output is not sorted unless
you ask for it to be.


> Please also note that by adding the rowid an unstable sort-algorithm
> can produce a stable sort-outcome.

Add an 'order by' clause and a rowid to your select.




                
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