Why not to Join Fatc to fact tables in OBIEE... What is the Logical Reason

Why not to Join Fatc to fact tables in OBIEE... What is the Logical Reason
Thanks in advance
V

Hi Venkat,
I am coming from the basics of a star schema here, so hope it helps
What is a fact?
A fact is something that has all measures which can be aggregated (Units, Dollars, # of Orders) etc with keys to different dimensions.
What is a dimension?
It is the context with which we understand/record/retrieve the measures in the fact. We understand "# of Orders" for a product/By a customer etc.
So joining a dimension and a fact helps to answer the Who/What/When kind of business questions. Ex : Who bought these products? What was the product type? When these products were sold kind of...
Now just imagine tying up fact to another fact. With this kind of model, you can never answer any business question.
I have never tried joining a fact with another fact in OBI (But do not think it will allow it though :) )
Hope I am clear.
Thank you,
Dhar

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How to join Dimensions and Fact Tables in OBIEE

Hi All,
I need to create report which need to get the information from two fact tables and 7 dimensions. The granularity is not same in both the fact tables. One fact table is having common keys between all the dimension tables and second fact table have only two dimension keys but with different names. My requirement is to create the report by taking the measures from both the fact tables.
I have created joins between the second fact table and two dimension tables in physical and BMM layer and also set the highest level for all other dimension tables in the LTS of second fact table. when am creating report by taking the measures from both the fact tables, data is not getting for the measure which taken from the second fact table. Please advice me how to get the data for the measure which taken from the second fact table.
Thanks in Advancec !!

You have to use the level-base measure capabilities.
http://gerardnico.com/wiki/dat/obiee/bi_server/design/fact_table/level_based_measure_calculations
For all measures of the second fact table with the lowest grain (with two dimension keys), set for all dimension where you don't have any key the logical level to the "All" or "Total".
And UNSET the highest level of the LTS for the second fact table.
Success
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Multiple 'logical joins' between a fact table and one dimension table

It appears that one cannot create multiple ‘logical joins’ between a fact table and one dimension table in OBIEE using the Oracle BI Administration Tool. For example, considering a Business Model with a dimension table TIMES and a fact table FACT containing START_TIME and END_TIME, we would like to create separate logical joins from FACT to TIMES for the START_TIMEs and END_TIMEs? Obviously, the underlying foreign keys can be created, but as far as I can tell the Oracle BI Administration Tool doesn’t support this. The workaround would be to replicate the TIMES table, but that’s ugly.
I seek an alternative approach.

Try this. Create an two aliases for the TIMES dimension (Start & End) in the Physical Layer and then remove foreign key to the "Parent" Times dimension. Create the Foreign Key in the Physical Layer to the new aliases and then create the complex joins in the BMM Layer to the new aliases as well. This will allow you to present both dates within the same table in the Presentation Layer. Not the most elegant solution but it works.

Joining bridge ,dim,fact table

Hi
I have scenario where I have a bridge table,dimension table,and 2 fact tables.
The dimension table is a common table for both fact tables.
The bridge table contains the dimension tables Primary key.
The bridge is also having an other dimension table PK, but that table is not joined to any fact table.
Now I have a req where I have to get a column from bridge table and fact2 tables.
Individually when I pull those columns I am getting data.
When I pull those 2 columns together , getting " the specified criteria dint result in any data".
Tried changing joins in RPD nothing worked.please help me , this is very urgent.
In SQL developer when I joined bridge and fact or dimension and bridge I am able to get expected results.
Thanks
Sr

Hi Suyog,
Run this Program in SE38 SAP_INFOCUBE_DESIGNS .
This gives the Ratio aswell number of records.And also Dimension Mismatch.
Rgds
SVU

Unable to join 3 fact tables in obiee data model.

Hi,
I am unable to join the 3 fact tables in obiee rpd. If I join with 2 fact tables I got the data in repors, Once I add the one more fact table and join with related dimensions, I am getting nodata error. I am following all joins keys as per datamodel, I am able to see the data in database. anyone pls give me the solution. Thanks in advance.
Edited by: 1007582 on May 23, 2013 2:17 AM

Can you please give some more detail as in what you have model in RPD;
For example, if There are 3 Fact table F1, F2, F3 and two Dimesion Confirmed_D1, Non_Conf_D2. Confirmed_D1 is joined to all three fact tables and Non_Conf_D2 is joined to F2.
Now to implement this model we have to set the logical content level in BMM layer for Non_Conf_D2 in F1 & F2 to Total*. After this only we can report on Confirmed_D1, Non_Conf_D2, F1, F2, F3 whithout any error.
Sometime join with multiple table can also result in No Data, since the join conditions filters out the result data.
Please mark helpful or correct.
Regards,
Kashinath

OWB Newbie - Joining Dimensions to Fact Tables

Hello Forum,
This may seem like a simple question, but the documentation is so lacking that I can't seem to find the answer to "how does the tool" work.
I am creating a simple data mart starting with a star schema and choosing a deployment option of ROLAP.
When using the OWB Tool to create dimensions and fact tables, do you need to define your primary business key (coming from your source system) in each fact table for each dimension that will join to that fact table? I am assuming yes, at least at the lowest leaf level of the dimension hierarchy in this case Store_ID. How else would you be able to correctly join a particular sales order record to the store that it was sold in? a simple query that we know our users will execute for reporting purposes. To make myself clear here is a simple example:
Dimension = Store
Hierarchy = Store ----> Sales Territory ---->Region ----->Country
Attributes = Store ID (primary business key), Store_Name, Sales_Territory_ID, Sales_Territory_Description, Store_Manager_Name, Store_Location etc.,
Cube or Fact Table = Sales Orders
Measures = sale_price, quantity, drop_ship_cost, sales_tax, etc.,
Do I also need to create an attribute for Store ID so that when I load each sales order record into the fact table along with it comes it's proper Store ID?
I understand how the tool uses the surrogate key and business identifier to create a foreign key look-up from dimension to fact table and pull in the correct store description (i.e. name) but unless you have the Store ID as part of the sales record being loaded into the fact table I don't see how the you can traverse the table and join a sales order to it's proper store?
Can someone who is farther along in the process or has more experience with other components of the tool confirm my assumption or set me straight on how the tool accomplishes this?
thanks
monalisa

Hi Monalisa, I'll reply assuming your using OWB 10gR2.
First off, for each of the dimensions, you'll define a business key (as you noted below). Then, when you define the cube object, you'll tell it which dimensions you are using, along with the measures you will be storing.
When you drop a "cube" object into a map, it will show the measures, but it will replace the dimensions with their natural keys. I.e. in your example below, if your sales order cube had ONLY the store dimension, then the cube object will show up in a mapping with the measures of sales_price, quantity, drop_ship_cost, etc., but instead of showing the dimension for store, it will instead show the natural key Store_ID. When you map your data to load (which should be by store_id), OWB will automagically look up the proper dimension keys and do everything else for you.
Hope this helps!
Scott

Report based on fact tables that don't have the same dimensionality

Hi all
I want to combine in the same report different measures from different fact tables that doesn't have the same dimensionality,for example:
measure 1 linked to dimensions : time geography and product
measure 2 linked to dimensions : time and geography
Currenctly when I create a report like:
time----gepgraphy---product------measure 1-----measure 2 I don't have any data for measure2 because it's not linked to the product dimension.
The exact report is year---store name---product area name----- store sales-----number of visitors : the number of vistors doesn't have any relation with the product dimension.
Is there a way to create this kind of report??
Regards

Don't take this the wrong way guys, but I feel compelled to say this before the answers start coming in:
This issue had been discussed already many times. Stijn, John, Kishore etc. have all answered this question for the one or the other user. This forum has a search functionality for a reason. To first look for information and then ask your question. Why wait - potentially - a couple of hours for an answer that's one search away?
Seriously people. It's not like forums magically appeared in 2k7...they've been around for quite a while now and netiquette and common sense with regards to posting should become normal.
Cheers,
C.

Fact table have tow column reference the same dim table

In my analytic domain, my fact table have tow column reference the same dim table, but in physical diagram, between two table ,can only have one join, so i create a copy of the dim table, then finish the join in physical. This method can resolve this question, but not so good, Anyone have perfect solution?

user4497169 wrote:
Thanks,
yours method is very very good, I don't know this method before. Where do you get this imfomation?The sample sales RPD has (good) modelling references you can refer to, otherwise think about how you'd write the SQL Statement yourself, you'd need to use an alias to access the same table on seperate joins.

LTS of fact table in obiee 10g

Hi
In LTS for the fact table, I want to set the level to the lowest level of the dimension
How to achieve this.
Please suggest.

Hi,
To set the LTS level first you need to have the dimension hierarchy for that table, after that double click the LTS >> click on Content Tab >> there in level drop down you can select which level you want assign. so now select the lowest level from the drop down and save.
Mark if Helpful/correct.
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Why not to Join Fatc to fact tables in OBIEE... What is the Logical Reason

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