The calendar table only has one field which is the date, all the other tables in the report have a common field ( client_Id ) which join to a master table at the top of the chain, I can see how your idea would work in a straightforward two table join but I can't see how it will work in my case ( but I'm probably wrong ) to make things worse the date in the original table is stored as a string like '2016-12-30'
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