Highly recommended suggestion:
Put state and zipcode fields in the user table.
create state and zipcode tables that are flexible
and yet comform to the rest of the moodle database
with a method for an administrator to populate
them for their situation - country.
provide an admin option to activate each.
this will keep it organized and eliminate so many
different re-inventions of the same "wheel".
Enrolment
state and zip code
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