SELECT '01' AS CYCLE
, TO_CHAR(ADD_MONTHS( TRUNC(sysdate,'MM'), -1),'YYYYMMDD') AS STRT_DATE
, TO_CHAR(LAST_DAY(TRUNC(sysdate,'MM')-1),'YYYYMMDD') AS END_DATE
FROM DUAL
UNION ALL
SELECT '02' AS CYCLE
, TO_CHAR(ADD_MONTHS(TRUNC(SYSDATE, 'Q'), -3),'YYYYMMDD') AS STRT_DATE
, TO_CHAR((TRUNC(SYSDATE, 'Q') - 1),'YYYYMMDD') AS END_DATE
FROM DUAL
UNION ALL
SELECT '03' AS CYCLE
, CASE WHEN QT = '1' THEN TO_CHAR(SYSDATE,'YYYY')-1||'0701'
WHEN QT = '2' THEN TO_CHAR(SYSDATE,'YYYY')||'0101'
END STRT_DATE,
CASE WHEN QT = '1' THEN TO_CHAR(SYSDATE,'YYYY')-1||'1231'
WHEN QT = '2' THEN TO_CHAR(SYSDATE,'YYYY')||'0630'
END END_DATE
FROM (SELECT (CEIL(TO_CHAR(SYSDATE,'Q')/2)) AS QT FROM DUAL)
UNION ALL
SELECT '04' AS CYCLE
, TO_CHAR(add_months(sysdate,-12),'yyyy')||'0101' AS STRT_DATE
, TO_CHAR(add_months(sysdate,-12),'yyyy')||'1231' AS END_DATE
FROM DUAL