SQL for finding component navigation

SELECT P3.PORTAL_LABEL L3
, P2.PORTAL_LABEL L2
, P1.PORTAL_LABEL L1
, P.PORTAL_LABEL L0
, P.*
FROM PSPRSMDEFN P
, PSPRSMDEFN P1
, PSPRSMDEFN P2
, PSPRSMDEFN P3
WHERE P.PORTAL_URI_SEG2 = 'component'
AND P.PORTAL_PRNTOBJNAME = P1.PORTAL_OBJNAME
AND P1.PORTAL_PRNTOBJNAME = P2.PORTAL_OBJNAME
AND P2.PORTAL_PRNTOBJNAME = P3.PORTAL_OBJNAME
AND P.PORTAL_NAME = P1.PORTAL_NAME
AND P1.PORTAL_NAME = P2.PORTAL_NAME
AND P2.PORTAL_NAME = P3.PORTAL_NAME