Getting Distinct Entries In Query.

Mar 18, 2008

Hello,
I have a reference table.  This table has an effective date and end date, and I need to get a single set of values at a point in time.  Suppose the following hotel rating values are the values that I want to pull out of the table:
1  Star
2 Star
3 Star
4 Star
5 Star
This value has other information associated with it (benchmarks and such) and so it's possible that one of the 2 star entries gets end-dated, and then a new 2 Star entry gets created with an effective date and no end date.
How can I query so that I only get one 2 Star entry at any point, and get the point in time where the date is between the effective and end date, but only pull back a single set of entries, one distinct rating value.  So, suppose the first entry is end-dated 7/1, if I look at old data, I want to see the old benchmarks and so I want the previous entry end-dated 7/1; otherwise, I want to see the new end-date, with the new 2 star entry with no end date.
How do I do that?  Make sense?

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*********
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ahh!



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