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Picking the correct field value based on matching criteria range

GPSPOW
GPSPOW asked
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Last Modified: 2015-03-04
I would like to write a SQL statement that obtains a field value from a table with effective date ranges based on the value of another data field

An example is:
DRG Table:
Diagnosis Code            Length of Stay         EffectiveDate
700                                    5.7                              10/1/2013
700                                    5.9                               10/1/2014

Admissions:

DRG                    Admission Date                   Length Of Stay
700                              8/31/14                                5.7
700                            11/1/14                                  5.9

In this example, the admission date 8/31/14 is between 10/1/13 and 9/30/14 so the Length of Stay would be 5.7.  While the other admission had a date after 10/1/14 and before 9/30/15, has a Length Of Stay of 5.9.

I do I write the code to evaluate this from the two tables:  DRG and Admissions?

Thanks

Glen
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