Need a query for monthly Report

Question

Hello All,
I need a query for monthly report,
comp_code
emp_id
dept_id
work_day
100
A100
MECH
01/01/2013
100
A100
MECH
02/01/2013
100
A100
MECH
03/01/2013
100
A100
MECH
04/01/2013
100
A100
MECH
05/02/2013
100
A100
MECH
08/02/2013
100
A100
MECH
09/02/2013
100
A100
MECH
10/02/2013
100
A100
MECH
12/05/2013
100
A100
MECH
13/05/2013
100
A101
CIV
01/04/2013
100
A101
CIV
02/04/2013
100
A101
CIV
03/04/2013
100
A101
CIV
04/04/2013
100
A101
CIV
06/04/2013
100
A101
CIV
06/06/2013
100
A101
CIV
07/06/2013
100
A101
CIV
08/06/2013
100
A101
CIV
09/06/2013
100
A101
CIV
10/06/2013
100
A101
CIV
11/12/2013
100
A101
CIV
12/12/2013
100
A101
CIV
13/12/2013
100
A101
CIV
14/12/2013
    Dear friends this the sample table of my report.In which table has contain list of  employees with their working days(actual table has contain almost 5laks of records).
suppose user choose the date between 01/01/2013 and 31/12/2013 then the result should be like this.
comp_code
emp_id
dept_id
month
Total_work
100
A100
MECH
JANUARY
4
100
A100
MECH
FEBRUARY
2
100
A100
MECH
MARCH
0
100
A100
MECH
APRIL
0
100
A100
MECH
MAY
2
100
A100
MECH
JUNE
0
100
A100
MECH
JULY
0
100
A100
MECH
AUGUST
0
100
A100
MECH
SEPTEMBER
0
100
A100
MECH
OCTOBER
0
100
A100
MECH
NOVEMBER
0
100
A100
MECH
DECEMBER
0
100
A101
CIV
JANUARY
0
100
A101
CIV
FEBRUARY
0
100
A101
CIV
MARCH
0
100
A101
CIV
APRIL
5
100
A101
CIV
MAY
0
100
A101
CIV
JUNE
5
100
A101
CIV
JULY
0
100
A101
CIV
AUGUST
0
100
A101
CIV
SEPTEMBER
0
100
A101
CIV
OCTOBER
0
100
A101
CIV
NOVEMBER
0
100
A101
CIV
DECEMBER
4

Answer 1

Hi,
If you want the output to include months where no work was done (with 0 in the total_work column) then you need to outer-join a "table" that has one row per month, and make it a partitioned outer join:
WITH  got_end_points   AS
   SELECT  TRUNC (MIN (work_day), 'MONTH')   AS first_month
   ,       TRUNC (MAX (work_day), 'MONTH')   AS last_month
   FROM    table_x
,   all_months   AS
   SELECT  ADD_MONTHS (first_month, LEVEL - 1)   AS a_month
   ,       ADD_MONTHS (first_month, LEVEL)       AS next_month
   FROM    got_end_points
   CONNECT BY  LEVEL <= 1 + MONTHS_BETWEEN (last_month, first_month)
SELECT    t.comp_code
,         t.emp_id
,         t.dept_id
,         m.a_month
,         COUNT (t.work_day) AS total_work
FROM             all_months  m
LEFT OUTER JOIN  table_x     t  PARTITION BY (t.comp_code, t.emp_id, t.ept_id)
                                ON   t.work_day  >= a.a_month
                                AND  t.work_day  <  a.next_month
GROUP BY  t.comp_code
,         t.emp_id
,         t.dept_id
,         m.a_month
ORDER BY  t.comp_code
,         t.emp_id
,         t.dept_id
,         m.a_month
As posted, this include every month that is actually in the table.  You can change the first sub-query if you want to enter first and last months.
I hope this answers your question.
If not, post  a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all tables involved, and also post the results you want from that data.
Point out where the query above is giving the wrong results, and explain, using specific examples, how you get the correct results from the given data in those places.  If you changed the query at all, post your code.
Always say which version of Oracle you're using (e.g., 11.2.0.2.0).
See the forum FAQ: https://forums.oracle.com/message/9362002