select distinct a.obj_type as obj_type, b.obj_id as obj_id, a.date_value as anfangsdatum, b.date_value as enddatum
from obj_date a, obj_date b join obj_int i 
on b.obj_id = i.obj_id
where (a.field_id = 8
 and b.field_id = 7
 and a.obj_id = b.obj_id
 and a.obj_type=-17
 and (a.date_value >= '04.10.2007' or b.date_value >= '04.10.2007')
 and (
  (b.date_value >= '04.10.2007' and b.date_value <= DATEADD("d",4,'04.10.2007'))
  or
  (a.date_value >= '04.10.2007' and a.date_value <= DATEADD("d",4,'04.10.2007'))
 )
)
or
(i.int_value = 1 
 and i.obj_type = -17
 and i.version_id = 0
 and i.field_id = 5)