Sales BY Month

Question

I have following information in the table
Start Date -- End Date -- VOL -- AVG VOL
3/12/2008 -- 4/11/2008 -- 620 --- 20 (620 /31 Days)
4/12/2008 -- 6/23/2008 -- 1296 --     18 (1296/ 72 Days)
I have to provide the following results from the above data
Month --- Days --- Volume
2008-MAR -- 20 Days -- 400 ( 20*20)
2008-APR -- 30 Days -- 562 ((11*20) + (19 * 18))
2008-MAY -- 31 Days -- 558 (31*18)
2008-JUN -- 23 Days -- 414 (23*18)
Please suggest me if you know using advanced date function is that possible to write a simple query.

Answer 1

You scan only one time your table.
Regards salim.SELECT TO_CHAR (startdate, 'mm/yyyy'), SUM (AVG) volume, COUNT (1) days
  FROM (SELECT *
          FROM t
        MODEL
        PARTITION BY (ROWNUM RR)
        DIMENSION BY ( 1 RN)
        MEASURES( STARTDATE,ENDDATE ,VOL,AVG, ENDDATE-STARTDATE+1 DIFF, 0 VOLUME )
        (STARTDATE[ FOR RN FROM 1 TO DIFF[1] INCREMENT 1]= STARTDATE[1]-1+CV(RN),
        VOL[ FOR RN FROM 1 TO DIFF[1]INCREMENT 1]=VOL[1],
        AVG[ FOR RN FROM 1 TO DIFF[1]INCREMENT 1]=AVG[1]))
GROUP BY TO_CHAR(STARTDATE,'mm/yyyy')
ORDER BY TO_CHAR(STARTDATE,'mm/yyyy')
SQL> WITH t AS
  2           (SELECT TO_DATE ('3/12/2008', 'mm/dd/yyyy') startdate,
  3                   TO_DATE ('4/11/2008', 'mm/dd/yyyy') enddate, 620 vol, 20 AVG
  4             FROM DUAL
  5            UNION ALL
  6            SELECT TO_DATE ('4/12/2008', 'mm/dd/yyyy'),
  7                   TO_DATE ('6/23/2008', 'mm/dd/yyyy'), 1296, 18
  8            FROM DUAL)
  9  SELECT TO_CHAR (startdate, 'mm/yyyy'), SUM (AVG) volume, COUNT (1) days
10    FROM (SELECT *
11            FROM t
12          MODEL
13          PARTITION BY (ROWNUM RR)
14          DIMENSION BY ( 1 RN)
15          MEASURES( STARTDATE,ENDDATE ,VOL,AVG, ENDDATE-STARTDATE+1 DIFF, 0 VOLUME )
16          (STARTDATE[ FOR RN FROM 1 TO DIFF[1] INCREMENT 1]= STARTDATE[1]-1+CV(RN),
17          VOL[ FOR RN FROM 1 TO DIFF[1]INCREMENT 1]=VOL[1],
18          AVG[ FOR RN FROM 1 TO DIFF[1]INCREMENT 1]=AVG[1]))
19  GROUP BY TO_CHAR(STARTDATE,'mm/yyyy')
20  ORDER BY TO_CHAR(STARTDATE,'mm/yyyy');
TO_CHAR     VOLUME       DAYS
03/2008        400         20
04/2008        562         30
05/2008        558         31
06/2008        414         23
SQL> Edited by: Salim Chelabi on 2009-04-17 11:49