query to bring 6 rolling pay check date at any point of time

Hello

We have a date dimension dim_date, who knows the date on the calendar. I need to write a query that will always bring 6 rolling pay check dates Ant any point of time. There are 14 days between each pay cheque date and it's fall Friday. Please take as reference below and help me to write the query according to my condition. Thanks in advance.


Pay check date example:
23/03/2012
09/03/2012
24/02/2012
10/02/2012
27/01/2012

Thank you
Jay.

Hey, Jay,.

If the dates are always exactly 14 days apart, it means there is always exactly 6 of them in a period of 84 days, so you can do something like

WITH     got_target_date     AS
(
     SELECT     TO_DATE ( '03/31/2012'     -- or whatever
               , 'MM/DD/YYYY'
               )     AS taget_date
     FROM     dual
)
SELECT     X.pay_check_date
FROM     got_target_date     t
JOIN     table_x          x  ON     x.pay_check_date  BETWEEN  target_date - 83
                                AND        target_date
;

If the dates are not always exactly 14 days apart, you can find the last 6 on or before the deadline in this way:

WITH     got_r_num     AS
(
     SELECT     pay_check_date
     ,     ROW_NUMBER () OVER (ORDER BY  pay_check_date  DESC)
               AS r_num
     FROM     table_x
     WHERE     pay_check_date     <= TO_DATE ( '03/31/2012'     -- any target date
                            , 'MM/DD/YYYY'
                            )
)
SELECT       pay_check_date
FROM       got_r_num
WHERE       r_num      <= 6
;

I hope that answers your question.
If not, post a small example of data (CREATE TABLE and only relevant columns, INSERT statements) for all of the tables involved and the results desired from these data.
Explain, using specific examples, how you get these results from these data.
Always tell what version of Oracle you are using.

Tags: Database

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     and (
          pt_status in (select uss_status from user_selected_status where uss_cart_id in (select d from T))
          or not exists (select 1 from user_selected_status where uss_cart_id in (select d from T)))
    It works, but the data or mixed...
    If the user apply cart_2 and cart_3, I don't want to for example points to accl "L4C" with status "E", forthcoming.
    I just want to return the union all selected each carts.

    Of course I can loop over Cart ID, PL_SQL, and build the query dynamically, as:
    for cur_c in (select cart_id d from carts where cart_current = 'Y') loop
     l_query := l_query || 'select ... from ... where ...' || ' union all ';
end loop;
l_query := substr(l_query,1,length(l_query)-11);
    But imagine the user ask 500 wagons..., I've reached the limit of varchar2.
    I can't use a CLOB that I use Oracle APEX to view the report, and he expects the query a varchar2.

    I don't want to use a temporary table, as it is too slow for the application (I've tested).

    You have a solution?

    Thank you.

    Yann.

    Thanks for create/insert statements - makes it much easier to help :D

    Here's one way:

    SQL> select
  2  c.cart_id,
  3  p.pt_id,
  4  p.pt_type,
  5  p.pt_accl,
  6  p.pt_class,
  7  p.pt_status
  8  from carts c
  9  cross join points p
 10  where c.cart_current = 'Y'
 11  and ( not exists(select null from user_selected_types ust where ust.ust_cart_id = c.cart_id)
 12     or p.pt_type in (select ust.ust_type from user_selected_types ust where ust.ust_cart_id = c.cart_id)
 13      )
 14  and ( not exists(select null from user_selected_accls usa where usa.usa_cart_id = c.cart_id)
 15     or p.pt_accl in (select usa.usa_accl from user_selected_accls usa where usa.usa_cart_id = c.cart_id)
 16      )
 17  and ( not exists(select null from user_selected_classes usc where usc.usc_cart_id = c.cart_id)
 18     or p.pt_class in (select usc.usc_class from user_selected_classes usc where usc.usc_cart_id = c.cart_id)
 19      )
 20  and ( not exists(select null from user_selected_status uss where uss.uss_cart_id = c.cart_id)
 21     or p.pt_status in (select uss.uss_status from user_selected_status uss where uss.uss_cart_id = c.cart_id)
 22      )
 23  order by
 24  c.cart_id,
 25  p.pt_id
 26  ;

   CART_ID      PT_ID P PT_ACCL         PT_CLASS   P
---------- ---------- - --------------- ---------- -
         2          4 B CTF1            RF45Q33    E
         2         10 S CTF1            CCMBQX     A
         2         11 S CTF1            CCMBQX     E
         2         12 S CTF2            CCMBQX     A
         2         13 S CTF2            CCMBQX     E
         3          5 T L4C             H4V1       A

6 rows selected.

    The cross join creates all the possible combinations of carriage/point. Then they are checked for 4 columns according to your rules. I think that the result is correct, if I read your question right?

    If it's the most effective depends a lot on your actual data. Are the usual cases each cart sets a very small subset of points, or each cart will usually define a substantial part of the points. Carts of how are your tables? How many tables of user_selected_? How is the distribution? How many points? Indexes are available?

    If the data are such that it can "pay" to build all of the possible production and "weed" down, then the foregoing can be very effective. If the data is such that the result is usually very small subset then the effectiveness may depend on the index are available.

    Test and see if it works for you ;-)
    If it takes hours, so if please give some information on the quantity and distribution of the data and the expected quantity and size carts etc. Then we could think in a different way...

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