Unexpected results getting data from two fact tables through conformed dim

Question

Hi all,
We are getting an unexpected behaviour in our OBIEE 10.1.3.3.3. We have this scenario:
We have {color:#0000ff}2 fact tables{color}{color:#000000} called F1 and F2. F1 has one measure, f1m1 and F2 has another one, f2m1.
We have {color:#0000ff}4 conformed dimensions{color}, called D1, D2, D3, Date.
When we are requesting for individual fact tables, we are getting:
date d1 d2 d3 f1m1
dt1 - x - y - z - m1
dt1 - x - y - z' - m2
date d1 d2 d3 f2m1
dt1 - x - y - z - m3
dt1 - x - y - z'' - m4
But, trying to obtain a compare scenario, we are getting
date d1 d2 d3 f1m1 f2m1
dt1 x y z m1 m4
Instead of
date d1 d2 d3 f1m1 f2m1
dt1 x y z m1 m3
Looking at query log, we have catched the reason. That's why BI Server is using to solve this request using ROW_COUNT() to join SAWITH0 and SAWITH1 in SAWITH2 result set. So, the order may not be the same in the results sets in every fact table. More or less, generated query is like:
WITH
SAWITH0 AS
(select ....
from F1),
SAWITH1 AS
(select ...
from F2),
SAWITH2 AS
select from (select ...
ROW_NUMBER() OVER PARTITION (....) c10
from SAWITH0.d1 full outer join SAWITH1.d1 ....) D1
{color:#ff0000}where (D1.c10 = 1){color}
select SAWITH2. ....
from SAWITH2
order by c1..c10
The problems seems to be that BI server is ordering the result sets SAWITH0 and SAWITH1 and getting row number to join this results sets, but this is not getting the correct result.
Any ideas?
TIA
Javier
{color}
Edited by: jirazazábal on Mar 13, 2009 2:46 PM

Answer 1

I have done a logical fact table with two fact table source on it.
The Sql performed against the database was this one.
-------------------- Sending query to database named PRODS_AIX (id: <<153418>>):
WITH
SAWITH0 AS (select sum(T21296.CONSUMERS_SALES_EURO) as c1,
     T21309.DIVISION_CODE as c2
from
     DIVISION T21309,
     C_CONSUMERS_SALES T21296
where  ( T21296.DIVISION = T21309.DIMENSION_KEY )
group by T21309.DIVISION_CODE),
SAWITH1 AS (select sum(T21356.ORDER_VALUE) as c1,
     T21309.DIVISION_CODE as c2
from
     DIVISION T21309,
     DWH_SALES_ORDER_OVERVIEW T21356
where  ( T21309.DIMENSION_KEY = T21356.DIVISION_KEY )
group by T21309.DIVISION_CODE)
select distinct case  when SAWITH0.c2 is not null then SAWITH0.c2 when SAWITH1.c2 is not null then SAWITH1.c2 end  as c1,
     SAWITH0.c1 as c2,
     SAWITH1.c1 as c3
from
     SAWITH0 full outer join SAWITH1 On nvl(SAWITH0.c2 , 'q') = nvl(SAWITH1.c2 , 'q') and nvl(SAWITH0.c2 , 'z') = nvl(SAWITH1.c2 , 'z')
order by c1As you can see one select (SAWITH0) for the first fact table C_CONSUMERS_SALES and one select for the second fact table DWH_SALES_ORDER_OVERVIEW (SAWITH1 ) and the two statement are joined with a full outer join.
I ask me why you have the three select (SAWITH0,SAWITH1 and SAWITH2). Can you please paste the complete SQL performed ?
Can you tell us also which SQL is performed if you select only the columns from one fact table and not for the other ?
Regards
Nico
http://gerardnico.com