> Sorry if this is obvious to someone - I've just spent 20 minutes
> googling around for the answer. I created a bunch of new columns by
> throwing some sql at my table, and many, but not all, of the field
> names have a dashed underline in phpMyAdmin. What does it mean?


(from my memory of a long time ago)
I think it means you defined a comment for that field and it is
PhpMyAdmin's polite way to show you can "hover" your mouse over it and
read it.

Best regards.