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The Data Warehouse Development Life Cycle

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Unnormalized Form

In any case, relations with repeating groups are not supported by Oracle, and they must be moved into new relations. Here are some relations from Chapter 3 which have repeating groups:

Transaction =
{ trans_type = | GC |, quantity_sold, product_description, total_price },
999 | WT |
| N/A |
total_sale_amount = { total_price },

grocery_club_discount =
{ trans_type = | GC |, quantity_sold, product_description, total_discount },

total_discount_amount = {total_discount },

In this case, you can see that a customer transaction consists of many repeating groups, and each of these groups will be moved from the transaction relation. Also, notice that some of the repeating groups, such as total_discount_amount, are derived from the sum of other values in the transaction relation. In those cases, we must make a conscious decision whether to redundantly store these summations or have Oracle compute them at runtime.

This is an excerpt from "High Performance Data Warehousing", copyright 1997.

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