Benefits of a Data Warehouse

Benefits of a Data Warehouse

What are Dimensions and Measures?

What is a Chasm Trap

What is a Chasm Trap

Simply put: A chasm occurs when a series of joins crosses a many >- one -<>

A >- B -<>

If I were to write a query that spanned all three of those tables the data from table A and C would be duplicated and measure values would be inflated. The inflation factor can be determined by counting the number of rows from the left that match a particular key and multiplying by the number of rows on the right....... for more details