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What type of fact table / loading solution for a reservation system?

I am designing a Data Warehouse with SQL Server 2012 and SSIS. The source system handles hotel reservations. The reservations are split between two tables, header and header line item. The ...
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Should I use conventional or computed columns for trivial metrics in a fact table?

A fact table can often have measures which are basically trivial. For example Orders.NumOrders will probably be "1" for every real record (synthetic records representing "no order" may populate this ...