It would be useful, during the transition time from
older MySQL versions to the most recent, that
phpMyAdmin would have a batch change feature for the
collations of each column in a table. In a large tables
with tens of text fields, it would be easy to just
check a checkbox "Change all column collations" when
changing the default collation for the whole table.
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Moved to RFE.
Implemented with https://github.com/phpmyadmin/phpmyadmin/pull/1699