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Semi-Additive over Date AND Time Dimensions?

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Hi,I am continually thinking that this must be possible... but how do you do semi-additive measures over DimDate and DimTime, i just can't figure it out.The only way i can potentially see this working is with a Date and Time dimension merged... but that would just be hideous! Assuming you go down to the minute, it's still over half a million members per year...So, if you have a fact with a grain of say... hour. How do you attach two dimensions (Date and Time), and still get it to be semi-additive... Thanks!

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