Si comme nous, il vous est arrivé de récupérer un dump MySQL de données UTF-8 stockées dans un storage latin et que vous voyez de beaux caractères é, è, etc. voila une solution pas très optimale mais qui aura le mérite de vous sauver une bonne partie du contenu.

UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'’','‘');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'°','°');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'à','Ã ');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'á','á');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'â','â');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ã','ã');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ä','ä');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'å','Ã¥');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'æ','æ');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ç','ç');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'è','è');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'é','é');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ê','ê');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ë','ë');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ì','ì');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'í','Ã' );
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'î','î');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ï','ï');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ð','ð');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ñ','ñ');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ò','ò');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ó','ó');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ô','ô');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'õ','õ');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ö','ö');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ù','ù');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ú','ú');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'û','û');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ü','ü');
UPDATE `table_name` SET `column_name` = REPLACE(`column_name`,'ý','ý');