search the records with:
"=" in the field Notes (without quotes)
Thank you Gianandrea, but I don't understand how to search that way. Then how do I delete all the other records (there are 140,000)?
Enter Find mode
in the field "Notes" type "=" (no quotes)
in this way you find all records that have nothing in the field Notes
Thank you very much for helping Gianandrea!
I've done that now, but then how do I delete all the blank records (there are 140,000)?
Pull down the records menu and select Delete Found Records. (you might first review the found records to make sure that you really want to delete all of these.)
Brilliant! Thank you very much for your kindness Phil and Gianandrea - job done!