query/right join/

query/right join/

Ultimately we are trying to find the ZZOMTAB.STAFF
I know the value exist because I have queried this by
K_NO
By this query

Select
ZZOMTAB.STAFF
from
ZZOMTAB
where
K_NO = 146735

so it is there
but what I am supplied with is app_no=79219

I have tried this query and it does not work ( no value in the ZZOMTAB.STAFF)
SELECT
ZZOMTAB.STAFF
FROM TKASERTAB
RIGHT JOIN ZZOMTAB
ON TKASERTAB.K_NO = ZZOMTAB.K_NO

RIGHT JOIN APPTAB
ON TKASERTAB.app_no= APPTAB.app_no

where
APPTAB.app_no=79219


the value that I am trying to get is in ZZOMTAB.STAFF
and I am given with app_no=79219

the tables are

tables are
TKASERTAB with columns K_NO and APPNO
APPTAB with column APPNO
and
ZZOMTAB with K_NO

I am trying to get the value of ZZOMTAB.STAFF
Can someone help??
Thanks in adv