Logical And Physical Joins Of  SH_PartTwo.rpd provided  by oracle OBIEE

Hi,
I am new the OBIEE tool.After downloading SH_PartTwo.rpd .Planned to recreate the physical and logical joins.
If any one has already tried this, kindly explain why we are creating Alias tables of (SALES,TIMES)and joining COSTS to them instead of directly joining to Sales fact table. Below is the table structure.My question again,previously in SH.rpd we were joining Sales fact with other dimensions.If I need cost data then why should'nt I join cost with sales.
Thanks for your cooperation in advance.
Regards,
Sreekanth
Costs Sales Times Customers Countries Products Promotions Channels
Timeid Timeid Timeid
Productid Productid Productid
Promotionid Promotionid Promotionid
Channelid Channelid Channelid
Custid Custid
Countryid Countryid
Unitcost Amount_sold

Well don't know the example anymore ;)
But you normally will make aliasses to reuse the object.
So if you have a time dimension, and you have all kind of fields, like date_sold, date_bought, date_paid...
Now if you connect those dates directly to the time dimension, then you can get very odd reports... if you use aliasses, then the times have nothing to do with each other...
So it is always better to use aliasses... you never know if you need a table only once..

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