> SELECT * FROM Hauptantrag WHERE (select datenfeldname from datenexport)
> > (select datum_von from datenexport) AND (select datenfeldname from
> datenexport) < (select datenexport.datum_bis from datenexport) limit 10;
It is not correct. You have not defined the condition between hauptantrag
& datenexport tables. Forward the table structures for assistance.
regards,
bhuvaneswaran