To Nathan and Manu: Thanks for advice, you're on the right track I'm sure, as it's pretty clear SQL is making its decision based on early records. I apparently haven't yet been able to force the Excel spreadsheet to convert the column to text, or if I have, the conversion doesn't survive into SQL. It always seems to be successfully converted, but the NULLS remain. I'm working on it. (I find the Excel documentation for the Formula Palette very unhelpful.) Exporting the spreadsheet into text is of course one way to do it, and that works fine, but I'm still trying to save a step using the =TEXT() method. Is there a secret? Might it fail even if the conversion succeeds?
Thanks,
Tadpcf