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", ROUND (COUNT (1) / 24, 2) "Avg"
    FROM gv$log_history
   WHERE first_time >= trunc(SYSDATE) - 20
   and thread# = inst_id
GROUP BY TRUNC (first_time), TO_CHAR (first_time, 'Dy')
ORDER BY 1 DESC;

Date                Day         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     Avg
------------------- ------ ---------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- -------
...
2016-01-03 00:00:00 Sun             4    0    0    0    0    0    4    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0    0     .17

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