g.britton (7/27/2014)

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Much better to use a date dimension table that contains all relevant date info for your company. You can include columns like 'IsHoliday' or 'IsWeekend' as well as fiscal half-year, quarter, week and day and anything else that is useful to your company. Use a PK of yyyymmdd as an integer. Update the table as needed (maybe only once a year) and join it to your queries instead of calculating these things every time. Avoid errors from the get-go.