Select * from TEST01 Where
TEST01.LAUFNUMMER in
(Select DATEI02.PK From Datei02

inner join HEADER on HEADER.LAUFNUMMER = DATEI02.PK

Where HEADER.TIMESTAMP between '2019-07-08 00:00:00' and '2019-07-15 00:00:00'

OR DATEI02.TIMESTAMP between '2019-07-17 00:00:00' and '2019-07-24 00:00:00')