Analytic Query Help

Question

My table has student grades by date. For each student, I need to return the date of the most recent F, and the number of consecutive F's the student had made at that time (NOT the total number of F's). So, for the table data below, I want the sql to return...
JANE 16-NOV-07 2
BILL 23-APR-07 4
NAME          DATE          GRADE
JANE          08-Feb-08          B
JANE          28-Dec-07          B
JANE          16-Nov-07          F
JANE          05-Oct-07          F
JANE          24-Aug-07          C
JANE          13-Jul-07          C
JANE          01-Jun-07          C
JANE          20-Apr-07          C
JANE          09-Mar-07          A
JANE          26-Jan-07          F
JANE          15-Dec-06          B
JANE          03-Nov-06          B
JANE          22-Sep-06          F
JANE          11-Aug-06          F
JANE          30-Jun-06          F
JANE          19-May-06          F
JANE          07-Apr-06          C
JANE          24-Feb-06          C
JANE          13-Jan-06          C
BILL          28-Jan-08          C
BILL          03-Dec-07          C
BILL          08-Oct-07          B
BILL          13-Aug-07          B
BILL          18-Jun-07          B
BILL          23-Apr-07          F
BILL          26-Feb-07          F
BILL          01-Jan-07          F
BILL          06-Nov-06          F
BILL          11-Sep-06          C
BILL          17-Jul-06          C
BILL          22-May-06          F
BILL          27-Mar-06          F
BILL          30-Jan-06          F

Answer 1

Find the Latest date of an F (over the students set of data) and then find the latest date of a NON-F within that set. Then take all records between the lower and upper (inclusive) bound.
ME_XE?    WITH Data AS
  2  (
  3     SELECT 'JANE' AS Student, TO_DATE('08-Feb-08','DD-MON-RR') AS Grade_date, 'B' AS Grade FROM DUAL UNION ALL
  4     SELECT 'JANE' AS Student, TO_DATE('28-Dec-07','DD-MON-RR') AS Grade_date, 'B' AS Grade FROM DUAL UNION ALL
  5     SELECT 'JANE' AS Student, TO_DATE('16-Nov-07','DD-MON-RR') AS Grade_date, 'F' AS Grade FROM DUAL UNION ALL
  6     SELECT 'JANE' AS Student, TO_DATE('05-Oct-07','DD-MON-RR') AS Grade_date, 'F' AS Grade FROM DUAL UNION ALL
  7     SELECT 'JANE' AS Student, TO_DATE('24-Aug-07','DD-MON-RR') AS Grade_date, 'C' AS Grade FROM DUAL UNION ALL
  8     SELECT 'JANE' AS Student, TO_DATE('13-Jul-07','DD-MON-RR') AS Grade_date, 'C' AS Grade FROM DUAL UNION ALL
  9     SELECT 'JANE' AS Student, TO_DATE('01-Jun-07','DD-MON-RR') AS Grade_date, 'C' AS Grade FROM DUAL UNION ALL
10     SELECT 'JANE' AS Student, TO_DATE('20-Apr-07','DD-MON-RR') AS Grade_date, 'C' AS Grade FROM DUAL UNION ALL
11     SELECT 'JANE' AS Student, TO_DATE('09-Mar-07','DD-MON-RR') AS Grade_date, 'A' AS Grade FROM DUAL UNION ALL
12     SELECT 'JANE' AS Student, TO_DATE('26-Jan-07','DD-MON-RR') AS Grade_date, 'F' AS Grade FROM DUAL UNION ALL
13     SELECT 'JANE' AS Student, TO_DATE('15-Dec-06','DD-MON-RR') AS Grade_date, 'B' AS Grade FROM DUAL UNION ALL
14     SELECT 'JANE' AS Student, TO_DATE('03-Nov-06','DD-MON-RR') AS Grade_date, 'B' AS Grade FROM DUAL UNION ALL
15     SELECT 'JANE' AS Student, TO_DATE('22-Sep-06','DD-MON-RR') AS Grade_date, 'F' AS Grade FROM DUAL UNION ALL
16     SELECT 'JANE' AS Student, TO_DATE('11-Aug-06','DD-MON-RR') AS Grade_date, 'F' AS Grade FROM DUAL UNION ALL
17     SELECT 'JANE' AS Student, TO_DATE('30-Jun-06','DD-MON-RR') AS Grade_date, 'F' AS Grade FROM DUAL UNION ALL
18     SELECT 'JANE' AS Student, TO_DATE('19-May-06','DD-MON-RR') AS Grade_date, 'F' AS Grade FROM DUAL UNION ALL
19     SELECT 'JANE' AS Student, TO_DATE('07-Apr-06','DD-MON-RR') AS Grade_date, 'C' AS Grade FROM DUAL UNION ALL
20     SELECT 'JANE' AS Student, TO_DATE('24-Feb-06','DD-MON-RR') AS Grade_date, 'C' AS Grade FROM DUAL UNION ALL
21     SELECT 'JANE' AS Student, TO_DATE('13-Jan-06','DD-MON-RR') AS Grade_date, 'C' AS Grade FROM DUAL UNION ALL
22     SELECT 'BILL' AS Student, TO_DATE('28-Jan-08','DD-MON-RR') AS Grade_date, 'C' AS Grade FROM DUAL UNION ALL
23     SELECT 'BILL' AS Student, TO_DATE('03-Dec-07','DD-MON-RR') AS Grade_date, 'C' AS Grade FROM DUAL UNION ALL
24     SELECT 'BILL' AS Student, TO_DATE('08-Oct-07','DD-MON-RR') AS Grade_date, 'B' AS Grade FROM DUAL UNION ALL
25     SELECT 'BILL' AS Student, TO_DATE('13-Aug-07','DD-MON-RR') AS Grade_date, 'B' AS Grade FROM DUAL UNION ALL
26     SELECT 'BILL' AS Student, TO_DATE('18-Jun-07','DD-MON-RR') AS Grade_date, 'B' AS Grade FROM DUAL UNION ALL
27     SELECT 'BILL' AS Student, TO_DATE('23-Apr-07','DD-MON-RR') AS Grade_date, 'F' AS Grade FROM DUAL UNION ALL
28     SELECT 'BILL' AS Student, TO_DATE('26-Feb-07','DD-MON-RR') AS Grade_date, 'F' AS Grade FROM DUAL UNION ALL
29     SELECT 'BILL' AS Student, TO_DATE('01-Jan-07','DD-MON-RR') AS Grade_date, 'F' AS Grade FROM DUAL UNION ALL
30     SELECT 'BILL' AS Student, TO_DATE('06-Nov-06','DD-MON-RR') AS Grade_date, 'F' AS Grade FROM DUAL UNION ALL
31     SELECT 'BILL' AS Student, TO_DATE('11-Sep-06','DD-MON-RR') AS Grade_date, 'C' AS Grade FROM DUAL UNION ALL
32     SELECT 'BILL' AS Student, TO_DATE('17-Jul-06','DD-MON-RR') AS Grade_date, 'C' AS Grade FROM DUAL UNION ALL
33     SELECT 'BILL' AS Student, TO_DATE('22-May-06','DD-MON-RR') AS Grade_date, 'F' AS Grade FROM DUAL UNION ALL
34     SELECT 'BILL' AS Student, TO_DATE('27-Mar-06','DD-MON-RR') AS Grade_date, 'F' AS Grade FROM DUAL UNION ALL
35     SELECT 'BILL' AS Student, TO_DATE('30-Jan-06','DD-MON-RR') AS Grade_date, 'F' AS Grade FROM DUAL
36  ),
37     Max_F_Grade_date AS
38  (
39     SELECT
40        Student,
41        Grade_date,
42        Grade,
43        MAX(DECODE(Grade, 'F', Grade_date, NULL)) OVER (PARTITION BY Student) Max_F_Date,
44        MIN(DECODE(Grade, 'F', Grade_date, NULL)) OVER (PARTITION BY Student) Min_F_Date
45     FROM Data
46     ORDER BY Student, Grade_date DESC
47  ),
48     Final_set AS
49  (
50     SELECT
51        Student,
52        Grade_date,
53        Grade,
54        Max_F_Date,
55        MAX(DECODE(Grade, 'F', Min_F_Date, Grade_date)) OVER (PARTITION BY Student) Max_NON_F_Date
56     FROM Max_F_Grade_date
57     WHERE Grade_date <= Max_F_Date
58  )
59  SELECT
60     Student,
61     Max_F_Date,
62     COUNT(*)
63  FROM Final_set
64  WHERE grade_date >   Max_NON_F_Date
65  GROUP BY Student, Max_F_Date
66  /
STUDENT      MAX_F_DATE                           COUNT(*)
BILL         23-APR-2007 12 00:00                        4
JANE         16-NOV-2007 12 00:00                        2
2 rows selected.
Elapsed: 00:00:00.01