I'm trying to remove the first 3 characters characters from the
beginning of a VARCHAR string for a set of records.

something like:

update mytable
set myfield = [myfield, minus the first 3 characters]
where...

How would I do that?
I won't know how many total characters are in the string (it varies, but
always at least 4). All I know is that I need to remove the first 3.

Thanks,
Joe