问题4

删除字符串两边的"*"号，正确的语句是()

•  A select Trim('*Hello world**','*') from dual;

•  B select Trim(both'*' from'*Hello world**') from dual;

•  C select LTrim(both'*' from'*Hello world**') from dual;

•  D select RTrim(both'*' from'*Hello world**') from dual;