Update mysql table records, which contain umlaut

Use your database and run this MySQL command for your desired Table:

UPDATE YOUR_TABLE SET YOUR_FIELD = REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(YOUR_FIELD,'ä','ae'),'Ä','Ae'),'ö','oe'),'Ö','Oe'),'ü','ue'),'Ü','Ue');