>>And this what it centers with the name of the fields of the result?
>
>What it suppose to mean?

It means only that who has written the documentation
it has not understood a lot of things.

>
>>I hope that Aleksey he realizes where the error is
>>(it is in an array of names of the internal routine C++)
>>
>>Do you think that it is correct that these two queries return two different results?
>
>It works this way since Fox 2.6 at least. Unfortunately there's no clear description in VFP help on how the names of result set are derived in the SQL Select in case of UNION.

And therefore if a bug succeeds in surviving to 10 revisions of an application
does it turn him into a correct feature?

No, an old bug remains.

>That's why I always give the same name for the specific column in all SELECTs in UNION.

This is a workaround, nothing more.