Bridge tables and durable natural keys

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Bridge tables and durable natural keys

Post  nick_white on Mon Jan 06, 2014 7:14 am

Hi,
in the Data Warehouse Toolkit, Chapter 9, Figure 9.7 shows the Management Hierarchy Bridge table joining the Manager Dimension and the Employee Separation Fact table (using surrogate keys). A couple of paragraphs below this it states "You could use durable natural keys in the bridge table, instead of the employee keys which capture type 2 profile changes."

Can anyone clarify how this use of natural keys would be implemented - does this require the natural keys to be added to the Fact table as well (which is, generally, not a recommended practice) or, if not, how are the bridge table and fact table joined?

Thanks,
Nick

nick_white

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