SQL Query Month Insertion

Question

Hi,
I have a table with data below:
YEAR MONTH DIRECTION CHANNEL_ID COUNT_CURR_YR
2005 8 A CD 27
2005 10 A CD 37
2005 11 A CD 42
2005 12 A CD 41
2006 1 A CD 38
2006 2 A CD 36
2006 3 A CD 38
2006 4 A CD 52
2006 5 A CD 49
2006 6 A CD 39
2006 7 A CD 40
2006 8 A CD 45
2006 9 A CD 41
2006 10 A CD 41
2006 11 A CD 49
2006 12 A CD 34
2007 1 A CD 33
2007 2 A CD 29
2007 3 A CD 37
2007 4 A CD 32
2007 5 A CD 37
2007 6 A CD 33
2007 7 A CD 36
2007 8 A CD 37
2007 9 A CD 45
2007 10 A CD 36
2007 11 A CD 31
2007 12 A CD 34
2008 1 A CD 34
2008 2 A CD 36
2008 3 A CD 44
2008 6 A CD 35
2008 7 A CD 28
2008 8 A CD 34
2009 12 A CD 5
2005 8 A CH 138
2005 9 A CH 1
2005 10 A CH 152
2005 11 A CH 138
2005 12 A CH 136
2006 1 A CH 137
2006 2 A CH 125
2006 3 A CH 135
2006 4 A CH 132
2006 5 A CH 136
2006 6 A CH 144
2006 7 A CH 144
2006 8 A CH 142
2006 9 A CH 129
2006 10 A CH 126
2006 11 A CH 117
2006 12 A CH 129
2007 1 A CH 120
2007 2 A CH 113
2007 3 A CH 134
2007 4 A CH 144
2007 5 A CH 135
2007 6 A CH 147
2007 7 A CH 136
2007 8 A CH 135
2007 9 A CH 135
2007 10 A CH 143
2007 11 A CH 143
2007 12 A CH 139
2008 1 A CH 118
2008 2 A CH 129
2008 3 A CH 134
2008 6 A CH 130
2008 7 A CH 140
2008 8 A CH 143
2009 12 A CH 22
71 rows selected
I want two things to be done:
1.Insert Rows for the months for which I do not have any data with 0 Values Example:
YEAR MONTH DIRECTION CHANNEL_ID COUNT_CURR_YR
2005 8 A CD 27
2005 1 A CD 0
2005 2 A CD 0
2005 12 A CD 41
Also I want another column added to this which will give me results for last year same month.
Example:
YEAR MONTH DIRECTION CHANNEL_ID COUNT_CURR_YR PREVIOUS_YR
2005 8 A CD 27 <Count of 8/2004>
2005 1 A CD 0 <Count of 1/2004>
2005 2 A CD 0 <Count of 2/2004>
2005 12 A CD 41 <Count of 12/2004>
The script to create table and insert dummy data is below:
CREATE TABLE TESTING_123
(YEAR NUMBER,
MONTH NUMBER,
DIRECTION VARCHAR2(1),
CHANNEL_ID VARCHAR2(2),
COUNT_CURR_YR NUMBER);
INSERT INTO TESTING_123 VALUES(2005,8,'A','CD',27);
INSERT INTO TESTING_123 VALUES(2005,10,'A','CD',37);
INSERT INTO TESTING_123 VALUES(2005,11,'A','CD',42);
INSERT INTO TESTING_123 VALUES(2005,12,'A','CD',41);
INSERT INTO TESTING_123 VALUES(2006,1,'A','CD',38);
INSERT INTO TESTING_123 VALUES(2005,8,'A','CH',138);
INSERT INTO TESTING_123 VALUES(2005,9,'A','CH',1);
INSERT INTO TESTING_123 VALUES(2005,10,'A','CH',152);
Let me know if you need any other info and thanks in advance for your help.
Edited by: 884073 on Sep 8, 2011 10:09 AM

Answer 1

Hi,
Welcome to the forum!
Thanks for posting the CREATE TABLE and INSERT statements, that's very helpful.
Don't forget to post the results you want from that data.
Explain how you get the results you want from the data given. For example, what role do direction and channel_id play in this problem? What should be the earliest and latest dates in the output?
Do you actually want to add new rows to the table, or do you just want the rows for missing months to appear in the output? I'm guessing that you only want them in the output. If you want to change the table, you can use soemthing like sub-query all_months in a MERGE statement.
WITH   got_year_month     AS
     SELECT     year, month, direction, channel_id, count_curr_yr
     ,     TO_DATE ( TO_CHAR (year) || TO_CHAR (MONTH, '00')
               , 'YYYY MM'
               )          AS year_month
     FROM    testing_123
--     WHERE     ...     -- if you need any filtering, put it here
,     all_year_months     AS
     SELECT     ADD_MONTHS ( start_year_month
                  , LEVEL - 1
                  )          AS year_month
     FROM    (
              SELECT  MIN (year_month)     AS start_year_month
              ,          MAX (year_month)     AS end_year_month
              FROM    got_year_month
     CONNECT BY     LEVEL <= 1 + MONTHS_BETWEEN (end_year_month, start_year_month)
SELECT       TO_CHAR (a.year_month, 'YYYY')     AS year
,       TO_CHAR (a.year_month, 'fmMM')     AS month
,       g.direction
,       g.channel_id
,       NVL ( g.count_curr_yr
           , 0
           )                         AS count_curr_yr
,       LAG ( NVL ( g.count_curr_yr
                    , 0
           , 3     -- 3 for testing, 12 for real
           )     OVER ( PARTITION BY  g.direction
                       ,          g.channel_id
                 ORDER BY          a.year_month
               )                    AS previous_yr
FROM           all_year_months  a
LEFT OUTER JOIN  got_year_month       g  PARTITION BY (direction, channel_id)
                                  ON  a.year_month     = g.year_month
ORDER BY  direction
,            channel_id
,       a.year_month
;Storing date information in NUMBER columns is a really bad idea. Think about using a DATE column, instead. If you must use two NUMBER columns, start the query by generating a DATE from them, as I didin the first sub-query, got_year_month.
Output:
YEAR MO D CH COUNT_CURR_YR PREVIOUS_YR
2005 8  A CD            27
2005 9  A CD             0
2005 10 A CD            37
2005 11 A CD            42          27
2005 12 A CD            41           0
2006 1  A CD            38          37
2005 8  A CH           138
2005 9  A CH             1
2005 10 A CH           152
2005 11 A CH             0         138
2005 12 A CH             0           1
2006 1  A CH             0         152Your sample data only covered a span of 6 months, so the previous_yr column should always be NULL. (If you want 0, then use "NVL (LAG ...)" where I used "LAG (NVL ..)" above.) To show how it works, I'm sjhowing the data from 3 months ago in the previous_yr column. You'll want to change the hard-coded 3 to 12.
Always say which version of Oracle you're using. This query will work in Oracle 10.1 (and higher).