Aggregating Slowly Changing Dimension

Question

Hi All:
I have a problem with whole lot of changes in the dimension values (SCD), need to create a view or stored procedure:
Two Tables within the Oracle db are joined
Tbl1: Store Summary consisting of Store ID, SUM(Sales Qty)
Tbl2(View): Store View created which consists of Store ID, Name, Store_Latest_ID
Join Relationship: Store_summary.Store_ID = Store_View.Store_ID
If I’m pulling up the report its giving me this info
Ex:
Store ID: Name, Sales_Qty , Store_Latest_ID
121, Kansas, $1200, 1101
1101, Dallas, $1400, 1200
1200, Irvine, $ 1800, Null
141, Gering, $500, 1462
1462, Scott, $1500, Null
1346,Calif,$1500,0
There is no effective date within the store view, but can be added if requested.
Constraints in the Output:
1)     If the Store Latest ID = 0 that means the store id is hasn’t been shifted (Ex: Store ID = 1346)
2)     If the Store Latest ID = ‘XXXX’ then that replaces the old Store ID and the next records will be added to the db to the new Store ID ( Ex: 121 to 1101, 1101 to 1200, 141 to 1462)
3)     Output Needed: Everything rolled up to the New Store ID irrespective of the # of records or within the view or store procedure whenever there is a Store Latest ID that should be assigned to the Store ID (Ex: the Max Latest Store ID Record for all the changing Store ID Values) and if the value of Latest Store ID is 0 then no change of the record.
I need the output to look like
Store ID: Name, Sales_Qty , Store_Latest_ID
1200,Irvine,$4400,Null
1462,Scott,$2000,Null
1346,Calif,$1500,Null or 0
The Query I wrote for the view creation:
Select ss.Store_ID, ss.Sales_Qty, 0 as Store_Latest_ID
From Store_Summary ss, Store_Details sd
Where ss.Store_ID=sd.Store_ID and sd.Store_Latest_ID is null
union
Select sd.Store_Latest_ID, ss.Sales_Qty, null
From Store_Summary ss, Store_Details sd
Where ss.Store_ID=sd.Store_Latest_ID and sd.Store_Latest_ID is not null
And placing a join to the created view to Store Summary ended up getting the aggreagation values without rolling up and also the Store ID's which are not having latest ids are ending up with a value 0 and the ss quantity aggregated, and if there are changes within store id for more than two times then its not aggreagating the ss quatity to the latest and also its not giving the store name of the latest store id.
I need help to create a view or stored procedure
Please let me know if you have any questions, Thanks.
Any suggestions would be really Grateful.
Thanks
Vamsi

Answer 1

Hi
Please see the following example
ID- Name -Dependants
100 - Tom - 5
101 - Rick -2
102 - Sunil -2
See the above contents...assume the ID represents employee ID and the dependants include parents, spouse and kids....
After sometime, dependants may increase over a period of time but noone is sure when exactly it will increase.....assume in case of a single get married and increase in dependants
So the attributes of the Employee had a slow chance of changing over the time
This kind of dimensions are called slowly changing dimensions
Regards
N Ganesh