extend the set of data

Hi all
Please find the below example scenario where I have to extend the set of data.
I working on oracle 10g and all by extending the data set, we should exclude weekends. The sample is only for 2 ID, but there may be more than one.
Thanks for your help.

 

ID                    ST_DT          END_DT          VAL 
====               ========         =======        ======== 
1                  2/2/2011             2/4/2011       4 
1                  2/4/2011             2/8/2011       5 
1                  2/8/2011                            6 
2                  1/28/2011           2/1/2011        2 
2                  2/1/2011                            8 

ID                    DT             VAL 
====                ========      =======        
1                 2/2/2011           4 
1                 2/3/2011           4 
1                 2/4/2011           5 
1                 2/7/2011           5 
1                 2/8/2011           6 
1                 2/9/2011           6 
2                 1/28/2011          2 
2                 1/31/2011          2 
2                 2/1/2011           8 
2                 2/2/2011           8 
2                 2/3/2011           8 
2                 2/4/2011           8 
2                 2/7/2011           8 
2                 2/8/2011           8 
2                 2/9/2011           8 

select 1 as id,to_date('02/02/2011','MM/DD/YYYY') as st_dt,to_date('02/04/2011','MM/DD/YYYY') as end_dt, 4 as val from dual 
union all 
select 1 as id,to_date('02/04/2011','MM/DD/YYYY') as st_dt,to_date('02/08/2011','MM/DD/YYYY') as end_dt, 5 as val from dual 
union all 
select 1 as id,to_date('02/08/2011','MM/DD/YYYY') as st_dt, null as end_dt, 6 as val from dual 
union all 
select 2 as id,to_date('01/28/2011','MM/DD/YYYY') as st_dt,to_date('02/01/2011','MM/DD/YYYY') as end_dt, 2 as val from dual 
union all 
select 2 as id,to_date('02/01/2011','MM/DD/YYYY') as st_dt,null as end_dt, 8 as val from dual;

Hello

I guess, when end_dt is NULL, you want to use the current date as end_dt, and the results you have posted are the desired results if the query is executed on February 10, 2011.

Here's one way:

WITH     got_n_days     AS
(
     SELECT     id, st_dt, end_dt, val
     ,     NVL ( end_dt
              , TRUNC (SYSDATE)
              ) - st_dt          AS n_days
     FROM     table_x
--     WHERE     ...     -- If you need any filtering, put it here
)
,     cntr          AS
(
     SELECT     LEVEL  - 1     AS n
     FROM     (
               SELECT  MAX (n_days)     AS max_n_days
               FROM     got_n_days
          )
     CONNECT BY     LEVEL <= max_n_days - 1
)
SELECT       d.id
,       d.st_dt + c.n          AS dt
,       d.val
FROM       got_n_days     d
JOIN       cntr          c  ON     c.n     < d.n_days
WHERE       TO_CHAR ( d.st_dt + c.n
              , 'DY'
            , 'NLS_DATE_LANGUAGE=ENGLISH'     -- If necessary
            ) NOT IN ('SAT', 'SUN')
ORDER BY  id
,            dt
;

Basically, each line of your original table must be repeated n times, where n is the number of days between (included) st_dt and end_dt (not included). The first subquery calculates this number and the main query results by combining your data with a "counter table", NTRC, which contains a line for each value of n that you may need. This 'table' is generated in the second auxiliary request.
The join produces a line for each day. The WHERE clause eliminates the Saturday and Sunday from these results.

Thanks for posting the sample data in a useful form. That really helps.

Published by: Frank Kulash, February 10, 2011 14:29

Tags: Database

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