I have set a column name to "group", which turned out to be a reserved word. Now I try to change the name to "group_code", but I get an error. I try:
ALTER TABLE task_values CHANGE group group_code VARCHAR(40) NOT NULL;
and
ALTER TABLE task_values CHANGE 'group' group_code VARCHAR(40) NOT NULL;
but both fail, I get "No such element" error. Please help