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update users set timezone='Europe/London' where uid not in (0);
update field_data_field_location set field_location_value = NULL where
+ field_location_value='select';
update field_revision_field_location set field_location_value = NULL w
+here field_location_value='select';
update field_data_field_profession set field_profession_value = NULL w
+here field_profession_value = 'select';
update field_revision_field_profession set field_profession_value = NU
+LL where field_profession_value = 'select';

while(<FILE>){
  $line = $_;
...
    print $1."\n";
  }
}

user
field_data_field_locatio
field_revision_field_locatio
field_data_field_professio
field_revision_field_professio

while(<FILE>){
  $line = $_;
...
    print $1."\n";
  }
}

users
field_data_field_location
field_revision_field_location
field_data_field_profession
field_revision_field_profession