Calender with single sql statement

Found this cool script from a oracle blog.

SELECT LPAD( MONTH, 20-(20-LENGTH(MONTH))/2 ) MONTH,"Sun", "Mon", "Tue",

"Wed", "Thu", "Fri", "Sat"

FROM (SELECT TO_CHAR(dt,'fmMonthfm YYYY') MONTH, week,

MAX(DECODE(TO_CHAR(dt,'d'),'1',LPAD(TO_CHAR(dt,'fmdd'),2))) "Sun",

MAX(DECODE(TO_CHAR(dt,'d'),'2',LPAD(TO_CHAR(dt,'fmdd'),2))) "Mon",

MAX(DECODE(TO_CHAR(dt,'d'),'3',LPAD(TO_CHAR(dt,'fmdd'),2))) "Tue",

MAX(DECODE(TO_CHAR(dt,'d'),'4',LPAD(TO_CHAR(dt,'fmdd'),2))) "Wed",

MAX(DECODE(TO_CHAR(dt,'d'),'5',LPAD(TO_CHAR(dt,'fmdd'),2))) "Thu",

MAX(DECODE(TO_CHAR(dt,'d'),'6',LPAD(TO_CHAR(dt,'fmdd'),2))) "Fri",

MAX(DECODE(TO_CHAR(dt,'d'),'7',LPAD(TO_CHAR(dt,'fmdd'),2))) "Sat"

FROM ( select dt, (case when dt >=

to_date(to_char(dt, 'dd/')||'12/'||to_char(sysdate,'yyyy'),'dd/mm/yyyy') and wk = '01' then '53' else wk end) week

from(

SELECT TRUNC(SYSDATE,'y')-1+ROWNUM dt, TO_CHAR(TRUNC(SYSDATE,'y')-1+ROWNUM+1,'iw') wk

FROM all_objects

WHERE ROWNUM <= ADD_MONTHS(TRUNC(SYSDATE,'y'),12) - TRUNC(SYSDATE,'y'))

)

GROUP BY TO_CHAR(dt,'fmMonthfm YYYY'), week)

ORDER BY TO_DATE( MONTH, 'Month YYYY' ), TO_NUMBER(week);