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 How to populate the fact table
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faizanayan
Starting Member

Austria
4 Posts

Posted - 06/06/2007 :  12:22:18  Show Profile  Reply with Quote
databse name: bookorder

Realtions:

customer (customerid,l_name,f_name,city, district,country)
cust_order(orderid,orderdate,customerid)
order_detail(orderid,itemno,isbn,quantity)
book(isbn,title,edition_no,price)
author(authorid,name,surname)
book_author(authorid,isbn,authorseqno)


Now populate the datawarehouse name: book_orderdw
having fact table & three dimension tables given below from the above bookorder database

fact table

factsales(customerid,timeid,isbn,unit_price,discount_price,sales_quantity,sales_amount)

dimension tables

dimcustomer(customerid,l_name,f_name,city,district,country)
dimtime(timeid,orderdate,dayofweek, month, year)
dimbook(isbn,title,edition_no,price)

Now I have to populate the fact & dimension tables by writing sql scripts.
Now I have already populated the dimension tables by writing sql script,
But I have to populate the fact table taking into account, here I am facing problem in wriring sql script

(i) unit_price is taken from the book base table with reference to the isbn
(ii) sales_quantity is taken from the order_detail.quantity with reference to table cust_order(via orderid & orderdate)
(iii) discount_price is determined dependent on the quantity. if the quantity > 20 then discount 20 %(i.e discount_price = 0.8 * unit_price). if quantity < 10, no discount i.e normal price. if quantity between 10 and 20, discount 10%. Note that the quantity is determined based on each order of each customer, thus if the same book appears at multiple positions in an order, those positions shall be grouped together. This could happen because the pk of the order_detail table is order_id + item no, not order_id + isbn
(iv) sales_amount is sales_quantity * discount_price

harsh_athalye
Flowing Fount of Yak Knowledge

India
5532 Posts

Posted - 06/06/2007 :  12:23:45  Show Profile  Visit harsh_athalye's Homepage  Click to see harsh_athalye's MSN Messenger address  Send harsh_athalye a Yahoo! Message  Reply with Quote
Duplicate Post: http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=84618

Harsh Athalye
India.
"The IMPOSSIBLE is often UNTRIED"
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