>I don't believe this is the case, though. I used to do data entry eight (or more) hours a day. When you're doing data entry full-time, you simply need a higher level of accuracy than that. Mixing up the Ctrl and Shift keys isn't exactly like typing a 4 instead of a 5.

Well, on my keyboard shift and ctrl are just as close together as 4 and 5. Seems like something that could happen pretty easily. So you're saying that when you did data entry you didn't have to hit the back-space many times per day?

>I wonder if pressing Ctrl+Z would bring the data back?

Ctrl-Z removes the NULL, but doesn't restore the data.