AccessDiscussion of Microsoft Access database design and programming. See also the forums for Access ASP and Access VBA.
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I think there's no point to that. date/time fields are usually stored in 32 bits, so date and time cannot be separated. If you need the index for faster access, then putting the index on the complete field should work fine.
Otherwise I'm not sure whether you need an index at all.
Thanks for you interest in my problem. I am afraid it would take too long to explain my problem, and as it happens I have devised another (better) solution to the issue.