Oracle Range Date usando Connect por semana, meses, etc.
SELECT DISTINCT TO_CHAR(z.START_DATE,'MMRRRR') MM
,TO_CHAR(z.START_DATE,'DD-MON-RRRR') START_DATE
,TO_CHAR(z.END_DATE,'DD-MON-RRRR') END_DATE
FROM (WITH C_RANGE AS
(SELECT TRUNC(:STARTDATE) + LEVEL - 1 FECHA_INI
,ADD_MONTHS(TRUNC(:STARTDATE),LEVEL) - 1 FECHA_FIN
FROM DUAL
CONNECT BY LEVEL <= (TRUNC(:ENDDATE) - TRUNC(:STARTDATE)))
SELECT DISTINCT
(CASE WHEN L.FECHA_INI = TRUNC(:STARTDATE) THEN TRUNC(:STARTDATE) ELSE ADD_MONTHS(L.FECHA_FIN,-1) +1 END) START_DATE
,(CASE WHEN L.FECHA_FIN +1 >= TRUNC(:ENDDATE) THEN TRUNC(:ENDDATE) ELSE L.FECHA_FIN END) END_DATE
FROM C_RANGE L
WHERE ADD_MONTHS(L.FECHA_FIN,-1) <= TRUNC(:ENDDATE)
AND TRUNC(:ENDDATE) >= TRUNC(:STARTDATE)) z
ORDER BY MM ASC ;
Joel Eusebio German