Oracle flashback Hourly info

Oracle flashback Hourly info http://anuj-singh.blogspot.com/2011/08/oracle-flashback-info.html

set term off term on
SET head on FEED off ECHO OFF LINES 1000 TRIMSPOOL ON TRIM on PAGES 1000
COLUMN separator HEADING "!|!|!"                 FORMAT A1
COLUMN "Date"  HEADING "Date"      FORMAT A9
COLUMN "Total" HEADING "Total|(#)" FORMAT 9999
COLUMN "Day"   HEADING "Day"       FORMAT A3
COLUMN h0      HEADING "h0|(#)"    FORMAT 999
COLUMN h1      HEADING "h1|(#)"    FORMAT 999
COLUMN h2      HEADING "h2|(#)"    FORMAT 999
COLUMN h3      HEADING "h3|(#)"    FORMAT 999
COLUMN h4      HEADING "h4|(#)"    FORMAT 999
COLUMN h5      HEADING "h5|(#)"    FORMAT 999
COLUMN h6      HEADING "h6|(#)"    FORMAT 999
COLUMN h7      HEADING "h7|(#)"    FORMAT 999
COLUMN h8      HEADING "h8|(#)"    FORMAT 999
COLUMN h9      HEADING "h9|(#)"    FORMAT 999
COLUMN h10     HEADING "h10|(#)"   FORMAT 999
COLUMN h11     HEADING "h11|(#)"   FORMAT 999
COLUMN h12     HEADING "h12|(#)"   FORMAT 999
COLUMN h13     HEADING "h13|(#)"   FORMAT 999
COLUMN h14     HEADING "h14|(#)"   FORMAT 999
COLUMN h15     HEADING "h15|(#)"   FORMAT 999
COLUMN h16     HEADING "h16|(#)"   FORMAT 999
COLUMN h17     HEADING "h17|(#)"   FORMAT 999
COLUMN h18     HEADING "h18|(#)"   FORMAT 999
COLUMN h19     HEADING "h19|(#)"   FORMAT 999
COLUMN h20     HEADING "h20|(#)"   FORMAT 999
COLUMN h21     HEADING "h21|(#)"   FORMAT 999
COLUMN h22     HEADING "h22|(#)"   FORMAT 999
COLUMN h23     HEADING "h23|(#)"   FORMAT 999
PROMPT
PROMPT *******************************************************************************************************************************************
PROMPT *   flashback   S U M M A R Y (By Frequency)
PROMPT *   (Hourly and Daily figures in number of flashback)
PROMPT *******************************************************************************************************************************************
PROMPT
PROMPT 
SELECT  to_char(trunc(first_time),'DD-Mon-YY') "Date",
        to_char(first_time, 'Dy') "Day",
         '|'                                               separator,
        count(1) Total,
         '|'                                               separator,
        SUM(decode(to_char(first_time, 'hh24'),'00',1,0)) "h0",
        SUM(decode(to_char(first_time, 'hh24'),'01',1,0)) "h1",
        SUM(decode(to_char(first_time, 'hh24'),'02',1,0)) "h2",
        SUM(decode(to_char(first_time, 'hh24'),'03',1,0)) "h3",
        SUM(decode(to_char(first_time, 'hh24'),'04',1,0)) "h4",
        SUM(decode(to_char(first_time, 'hh24'),'05',1,0)) "h5",
        SUM(decode(to_char(first_time, 'hh24'),'06',1,0)) "h6",
        SUM(decode(to_char(first_time, 'hh24'),'07',1,0)) "h7",
        SUM(decode(to_char(first_time, 'hh24'),'08',1,0)) "h8",
        SUM(decode(to_char(first_time, 'hh24'),'09',1,0)) "h9",
        SUM(decode(to_char(first_time, 'hh24'),'10',1,0)) "h10",
        SUM(decode(to_char(first_time, 'hh24'),'11',1,0)) "h11",
        SUM(decode(to_char(first_time, 'hh24'),'12',1,0)) "h12",
        SUM(decode(to_char(first_time, 'hh24'),'13',1,0)) "h13",
        SUM(decode(to_char(first_time, 'hh24'),'14',1,0)) "h14",
        SUM(decode(to_char(first_time, 'hh24'),'15',1,0)) "h15",
        SUM(decode(to_char(first_time, 'hh24'),'16',1,0)) "h16",
        SUM(decode(to_char(first_time, 'hh24'),'17',1,0)) "h17",
        SUM(decode(to_char(first_time, 'hh24'),'18',1,0)) "h18",
        SUM(decode(to_char(first_time, 'hh24'),'19',1,0)) "h19",
        SUM(decode(to_char(first_time, 'hh24'),'20',1,0)) "h20",
        SUM(decode(to_char(first_time, 'hh24'),'21',1,0)) "h21",
        SUM(decode(to_char(first_time, 'hh24'),'22',1,0)) "h22",
        SUM(decode(to_char(first_time, 'hh24'),'23',1,0)) "h23"
 from v$flashback_database_logfile 
where 1=1
group by trunc(first_time), to_char(first_time, 'Dy')
order by trunc(first_time)
/


              !       !
              ! Total !   h0   h1   h2   h3   h4   h5   h6   h7   h8   h9  h10  h11  h12  h13  h14  h15  h16  h17  h18  h19  h20  h21  h22  h23
Date      Day !   (#) !  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)  (#)
--------- --- - ----- - ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
09-Apr-23 Sun |    67 |    0    0    0    0    0    0    0    2    3    3    4    5    4    5    4    5    4    4    4    5    5    3    4    3
10-Apr-23 Mon |    23 |    4    2    3    3    2    2    4    3    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0