Missing date range in select

Question

Hello,
Database Version 10gr2(10.2.0.5)
This following data set is from my query, which the date range is weekly, where two week's date is missing (that's correct, because no data for those weeks). But I need to include that week date aslso with null or 0 values on. How to I select the running weeks from the following
Current data set
col1     week_date
4     04/14/2012
6     04/21/2012
5     05/12/2012
10     05/19/2012
2     05/26/2012
Expected result set
col1     week_date
4     04/14/2012
6     04/21/2012
*0     04/28/2012*
*0     05/05/2012*
5     05/12/2012
10     05/19/2012
2     05/26/2012Any help would be greatly appreciated.
Thanks,

Answer 1

Hi,
You can use CONNECT BY to gerenate all the dates you need, then outer join your actualdata to that result set, like this:
VARIABLE     start_date     VARCHAR2 (20)
VARIABLE     end_date     VARCHAR2 (20)
EXEC  :start_date := '04/14/2012';
EXEC  :end_date   := '05/26/2012';
WITH     all_dates     AS
     SELECT     TO_DATE (:start_date, 'MM/DD/YYYY')     + (7 * (LEVEL - 1))     AS week_date
     FROM     dual
     CONNECT BY     LEVEL <= 1 + ( ( TO_DATE (:end_date,   'MM/DD/YYYY')
                                 - TO_DATE (:start_date, 'MM/DD/YYYY')
                         / 7
SELECT       COUNT (x.week_date)     AS col1
,       a.week_date
FROM           all_dates  a
LEFT OUTER JOIN  table_x    x  ON  a.week_date = x.week_date
GROUP BY  a.week_date
ORDER BY  a.week_date
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.
Explain, using specific examples, how you get those results from that data.
Always say which version of Oracle you're using.
See the forum FAQ {message:id=9360002}
Edited by: Frank Kulash on May 21, 2012 5:05 PM