Star schema [fact 1:n dimension]...how?

Posted by Mike Gates on Server Fault See other posts from Server Fault or by Mike Gates
Published on 2010-05-06T23:17:40Z Indexed on 2010/05/06 23:29 UTC
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I am a newcomer to data warehouses and have what I hope is an easy question about building a star schema:

If I have a fact table where a fact record naturally has a one-to-many relationship with a single dimension, how can a star schema be modeled to support this? For example:

Fact Table: Point of Sale entry (the measurement is DollarAmount)
Dimension Table: Promotions (these are sales promotions in effect when a sale was made)

The situation is that I want a single Point Of Sale entry to be associated with multiple different Promotions. These Promotions cannot be their own dimensions as there are many many many promotions.

How do I do this?

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