Extend a range of dates

I have the following query, which works without problem. This will expand the range of dates, proof of identity, in a list of dates for me:
SELECT     j_id
          ,  date_1
           + LEVEL
           - 1
             datum
FROM       (SELECT 123 j_id, TO_DATE('01/01/2012', 'DD/MM/YYYY') date_1, TO_DATE('31/01/2012', 'DD/MM/YYYY') date_2
            FROM   DUAL)
CONNECT BY LEVEL <= (  date_2
                     - date_1
                     + 1);
How can I do this for more than 1 sheet well? for example
SELECT     j_id
          ,  date_1
           + LEVEL
           - 1
             datum
FROM       (SELECT 123 j_id, TO_DATE('01/01/2012', 'DD/MM/YYYY') date_1, TO_DATE('31/01/2012', 'DD/MM/YYYY') date_2
            FROM   DUAL
            UNION
            SELECT 456 j_id, TO_DATE('01/02/2012', 'DD/MM/YYYY') date_1, TO_DATE('29/02/2012', 'DD/MM/YYYY') date_2
            FROM   DUAL)
CONNECT BY LEVEL <= (  date_2
                     - date_1
                     + 1);
Thank you.

Hello

Here's one way:

WITH   cntr          AS
(
     SELECT     LEVEL - 1     AS n
     FROM     (
              SELECT  MAX (date_2 - date_1)     AS max_dif
              FROM    table_x
          )
     CONNECT BY     LEVEL <= 1 + max_dif
)
SELECT       x.j_id
,       x.date_1 + c.n
FROM       table_x  x
JOIN       cntr        c  ON  c.n <= x.date_2 - x.date_1
ORDER BY  x.j_id
,            c.n
;

If you do any filtering, it may be more effective to do this first. Start the WITH clause with a subquery that performs filtering, then use this result placed instead of your full table in the view online within the cntr as well as in the main query.
For example:

CREATE TABLE  table_x         AS
         SELECT 123 j_id, TO_DATE('01/01/2012', 'DD/MM/YYYY') date_1, TO_DATE('31/01/2012', 'DD/MM/YYYY') date_2
            FROM   DUAL
            UNION
            SELECT 456 j_id, TO_DATE('01/02/2012', 'DD/MM/YYYY') date_1, TO_DATE('29/02/2012', 'DD/MM/YYYY') date_2
            FROM   DUAL
UNION         SELECT 999,          TO_DATE ('01/01/2013', 'DD/MM/YYYY'),     TO_DATE ('31/12/2013', 'DD/MM/YYYY')     FROM dual
;

WITH     filtered_data     AS
(
     SELECT     *
     FROM     table_x
     WHERE     date_1     < TO_DATE ('01/07/2012', 'DD/MM/YYYY')
)
,        cntr          AS
(
     SELECT     LEVEL - 1     AS n
     FROM     (
              SELECT  MAX (date_2 - date_1)     AS max_dif
              FROM    filtered_data
          )
     CONNECT BY     LEVEL <= 1 + max_dif
)
SELECT       f.j_id
,       f.date_1 + c.n
FROM       filtered_data  f
JOIN       cntr              c  ON   c.n  <= f.date_2 - f.date_1
ORDER BY  f.j_id
,            c.n
;

Published by: Frank Kulash, 27 January 2012 10:10
Posted filtering example

Tags: Database

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