Calculated Column with simple math for price comparisons

Question

Hi all,
I want to calculate a price difference from today's price versus the price of 5 days ago.
Please help me with a best practice for that. Is the use of calculated column in a calculation view the right approach? How can the price field of 5 days ago be addressed? Ideally 5 should be a constant which should be able to be changed to 6 or 7 for further simulations.
Thanks for any help.
Guenther

Answer 1

Hi Patter ,
For the above requirement we don't need a calculation view to be created. Check the code below, I am re creating the scenario with an INNER JOIN.
  CREATE COLUMN TABLE "METALS_ONE_GEN"."TEST_TAB" (ID INTEGER,DATES DATE,PRICE INTEGER);
  INSERT INTO "METALS_ONE_GEN"."TEST_TAB" VALUES ( 1 , '2014-03-10',50);
    INSERT INTO "METALS_ONE_GEN"."TEST_TAB" VALUES ( 1 , '2014-03-15',50);
    INSERT INTO "METALS_ONE_GEN"."TEST_TAB" VALUES ( 1 , '2014-03-25',100);
    INSERT INTO "METALS_ONE_GEN"."TEST_TAB" VALUES ( 1 , '2014-03-20',80);
    INSERT INTO "METALS_ONE_GEN"."TEST_TAB" VALUES ( 1 , '2014-03-30',75);
    INSERT INTO "METALS_ONE_GEN"."TEST_TAB" VALUES ( 1 , '2014-04-04',150);
    INSERT INTO "METALS_ONE_GEN"."TEST_TAB" VALUES ( 1 , '2014-04-9',450);
select A.DATES,
       A.PRICE,
      ( B.PRICE - A.PRICE )
       from "METALS_ONE_GEN"."TEST_TAB" A
       INNER JOIN "METALS_ONE_GEN"."TEST_TAB" B
       ON
    B.DATES = ADD_DAYS(A."DATES",5) ;
Looks like, the JOIN operation is more optimized than the Calculation view in this case . Depends on the data , JOIN type may very .
Sreehari
Message was edited by: Sreehari V Pillai