Answer Posted / banjwolf
A junk dimension is a table containing all known or given
combinations of two or more other dimensions. It is then
used as a lookup from a fact table to find the combination
of dimensions that relate to that fact. The purpose is to
declutter and reduce the width of the fact table.
An example might be a [SalesFact] table which references a
junk dimension [SalesExtentionDIM] containing values/SKs
for dimensions of [OnSaleYN] , [SaleCodeSK] , [ColourSK] ,
[baggedYN]
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