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On Wed, Jan 28, 2015 at 12:36 PM, Peter Dow <petercdow@xxxxxxxxx> wrote:
"could be very fast - no calcs" sounds odd to me. Are date calculations
really slower than disk access?
I think the big benefit, performance-wise as well as code-wise, is
when you need to process lots of dates "in one go". You could have a
situation where you would need to repeat the same set of date
calculations for millions of records, and you need the results of
those calculations just to even DO a join or filter. What a date
table does is, essentially, precalculate everything, at the cost of
one extra join. It's a very scalable approach.
John Y.
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