How to write this query.. Please Help

Question

Hello Guys,
I have a table that contains all possible leave types, it is a look up table. Table name is Att_Leave_Types and data in the table is:
Leavetype_ID Leavetype_Desc
1 Annaul
2 Sick
3 Casual
4 Long
5 Maternity
Now, another table Att_Emp_Leaves Contains leaves of an employee
Columns and values are
Emp_ID leave_date levetype_id
14210 28-AUG-06 2
14210 30-AUG-06 3
14210 12-JUL-06 1
14210 13-JUL-06 1
14210 14-JUL-06 1
6902 27-AUG-06 2
6902 30-AUG-06 3
Now i want to get the following result from the query:
Group by month and year
list all leavetypes and leaves employee have availved, if no leavetype availved then the result must show 0 for the leavetype. calculate leaves for a month based on leavetype ID.
This result will help you clear what i result i want by my query.
MON_YYYY employee_id leavetype_id number_of_leaves
JUL-2006 14210 1 3
JUL-2006 14210 2 0
JUL-2006 14210 3 0
JUL-2006 14210 4 0
JU:-2006 14210 5 0
AUG-2006 14210 1 0
AUG-2006 14210 2 1
AUG-2006 14210 3 1
AUG-2006 14210 4 0
AUG-2006 14210 5 0
AUG-2006 6902 1 0
AUG-2006 6902 2 1
AUG-2006 6902 3 1
AUG-2006 6902 4 0
AUG-2006 6902 5 0
Please guide me and help me, its very urgent.
I will be thankful to you.
Regards,
Imran Baig

Answer 1

Here we are:
DROP TABLE Att_Leave_Types;
CREATE TABLE Att_Leave_Types
           Leavetype_ID NUMBER
          ,Leavetype_Desc VARCHAR2(30)
INSERT INTO Att_Leave_Types VALUES(1, 'Annual');
INSERT INTO Att_Leave_Types VALUES(2, 'Sick');
INSERT INTO Att_Leave_Types VALUES(3, 'Casual');
INSERT INTO Att_Leave_Types VALUES(4, 'Long');
INSERT INTO Att_Leave_Types VALUES(5, 'Maternity');
DROP TABLE Att_Emp_Leaves;
CREATE TABLE Att_Emp_Leaves
           Emp_ID NUMBER
          ,leave_date DATE
          ,leavetype_id NUMBER
INSERT INTO Att_Emp_Leaves VALUES (14210, TO_DATE('01-JUL-2006', 'DD-MON-YYYY'), 1);
INSERT INTO Att_Emp_Leaves VALUES (14210, TO_DATE('10-JUL-2006', 'DD-MON-YYYY'), 1);
INSERT INTO Att_Emp_Leaves VALUES (14210, TO_DATE('15-JUL-2006', 'DD-MON-YYYY'), 1);
INSERT INTO Att_Emp_Leaves VALUES (14210, TO_DATE('15-AUG-2006', 'DD-MON-YYYY'), 2);
INSERT INTO Att_Emp_Leaves VALUES (14210, TO_DATE('25-AUG-2006', 'DD-MON-YYYY'), 3);
INSERT INTO Att_Emp_Leaves VALUES (6902, TO_DATE('15-AUG-2006', 'DD-MON-YYYY'), 2);
INSERT INTO Att_Emp_Leaves VALUES (6902, TO_DATE('25-AUG-2006', 'DD-MON-YYYY'), 3);
SELECT
          LP.*
          ,EL.Leave_date
COLUMN Emp_ID FOR 999999
COLUMN Leave_Month FOR A8
COLUMN Leavetype_ID FOR 999
COLUMN Leavetype_desc FOR A10
COLUMN Leave_Count FOR 999
SELECT
           LP.Emp_ID
          ,TO_CHAR(LP.Leave_Month, 'MON-YYYY') Leave_Month
          ,LP.Leavetype_ID
          ,LP.Leavetype_desc
          ,COUNT(EL.Emp_ID) Leave_Count
     FROM
          SELECT *
               FROM
                    SELECT
                               Emp_ID
                              ,ADD_MONTHS(Min_Leave_month, RN - 1) Leave_Month
                              ,Max_Leave_month
                         FROM
                              SELECT ROWNUM RN FROM
                                   USER_OBJECTS
                                   WHERE ROWNUM <= 100
                              SELECT
                                         Emp_ID
                                        ,TRUNC(MIN(Leave_date), 'MM') Min_Leave_month
                                        ,TRUNC(MAX(Leave_date), 'MM') Max_Leave_month
                                   FROM Att_Emp_Leaves
                                   GROUP BY Emp_ID
                         WHERE ADD_MONTHS(Min_Leave_month, RN - 1) <= Max_Leave_month
                    ,Att_Leave_Types
               -- ORDER BY Emp_ID, Leave_Month, Leavetype_ID
          ) LP -- Leave periods
          ,Att_Emp_Leaves EL -- Employee leaves
     WHERE EL.Emp_ID(+) = LP.Emp_ID
          AND EL.Leavetype_ID(+) = LP.Leavetype_ID
          AND EL.Leave_date(+) >= LP.Leave_Month
          AND EL.Leave_date(+) < ADD_MONTHS(LP.Leave_Month, 1)
     GROUP BY
           LP.Emp_ID
          ,LP.Leave_Month
          ,LP.Leavetype_ID
          ,LP.Leavetype_desc
     ORDER BY
           LP.Emp_ID
          ,LP.Leave_Month
          ,LP.Leavetype_ID
EMP_ID LEAVE_MO LEAVETYPE_ID LEAVETYPE_ LEAVE_COUNT
  6902 AUG-2006            1 Annual               0
  6902 AUG-2006            2 Sick                 1
  6902 AUG-2006            3 Casual               1
  6902 AUG-2006            4 Long                 0
  6902 AUG-2006            5 Maternity            0
14210 JUL-2006            1 Annual               3
14210 JUL-2006            2 Sick                 0
14210 JUL-2006            3 Casual               0
14210 JUL-2006            4 Long                 0
14210 JUL-2006            5 Maternity            0
14210 AUG-2006            1 Annual               0
14210 AUG-2006            2 Sick                 1
14210 AUG-2006            3 Casual               1
14210 AUG-2006            4 Long                 0
14210 AUG-2006            5 Maternity            0
     BW