alter session set nls_date_format='YYYY-MM-DD';
set linesize 130
set pagesize 99
col Day for a6
col Total for 99999
col h0  for 99
col h1  for 99
col h2  for 99
col h3  for 99
col h4  for 99
col h5  for 99
col h6  for 99
col h7  for 99
col h8  for 99
col h9  for 99
col h10 for 99
col h11 for 99
col h12 for 99
col h13 for 99
col h14 for 99
col h15 for 99
col h16 for 99
col h17 for 99
col h18 for 99
col h19 for 99
col h20 for 99
col h21 for 99
col h22 for 99
col h23 for 99
col h24 for 99
 
SELECT  trunc(first_time) "Date",
        to_char(first_time, 'Dy') "Day",
        count(1) "Total",
        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$log_history
where   trunc(first_time)>sysdate-30
group by trunc(first_time), to_char(first_time, 'Dy')
Order by 1;
 
alter session set nls_date_format='YYYY-MM-DD HH24:MI:SS';