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simple question about dimension table
Posted by: Maron Vomr@
Date: February 10, 2011 10:25PM

Hi all ,

I am new to data warehouse world and need to know that I have a oltp structure where lets say there are 3 tables brand, category and product. Now in brand there is a field say name varchar(45) and in category there is also a field name varchar(45). So for OLTP it's different table and no problem.
But now when I am creating dimention table "product" and combining all these 3 tables in one Product dimension so how to incorporate that 'name' field as it will be duplicated and mysql wont allow so should I change the name to something meaningful or what is the dw concept for this.
And one more question. say in OLTP product table it has 100 rows and in category 5 and in brand 3. so how to populate the "product" dimension table by taking data from all these 3 tables.
Should I just run a query matching productID with category tables's product ID and then brandID with category tables brand ID and finally will get 100 rows in dimension table.

Thank you. hope I make myself clear.

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