Zkuste toto
UPDATE tablename
SET columnToCheck = REPLACE(CONVERT(columnToCheck USING ascii), '?', '')
WHERE ...
nebo
update tablename
set columnToCheck = replace(columnToCheck , char(146), '');
Zkuste toto
UPDATE tablename
SET columnToCheck = REPLACE(CONVERT(columnToCheck USING ascii), '?', '')
WHERE ...
nebo
update tablename
set columnToCheck = replace(columnToCheck , char(146), '');