Questions on journals

I have some really basic questions on using journals to recover from a bad
SQL based update to a file. The SQL was to update a single field and a
rather small number of records from what I was told, but updated several
hundred thousand before it was stopped. So the file was journaled with
Before and After images.

1st question I assume that what is journaled is the Entire Record not just
what was changed ( say 1 field ), correct?

2nd Question Since the file was in active use and other jobs could have
updated other fields of the modified records after the bad SQL was run I
don't think we can just use RMVJRNCHG cmd to backup those SQL changes and
then run APYJRNCHG from the SEQ directly following the the bad changes. If
we use the APLYJRNCHG to a recorded we rolled back it will just put the bad
data back if my assumption in #1 is correct?

Last question for now, What happens if there are triggers on this file if
we were to use RMVJRNCHG cmd? How about APYJRNCMD?

Thanks