Following is an example of my data, dates as YYYYMMDD:

Row 1: CustomerCode / Number / Effective Date / Expiration Date
Row 2: AAAAAAA-4 / SL00001 / 20040301 / 20050301
Row 3: AAAAAAA-3 / SL00001 / 20030301 / 20040301
Row 4: AAAAAAA-2 / SL00001 / 20020301 / 20030301
Row 5: AAAAAAA-1 / SL00001 / 20010301 / 20020301

I have an event date, for example 20030613. I need to find the correct
Customer Code so I can select other data stored on the same row. I'm lost
as how I can do a lookup the customer code where effective date =< event
date < expiration date. I have wondered about some INDEX function or a
SUMPRODUCT, but I have not advanced any.

Thank you for any insight.
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HansM