字符串判断 转换数字问题解决了 可以排序了。

字符串判断 转换数字问题解决了。工号可以正常排序了
SELECT b.*,TO_NUMBER(decode(decode(lower(nvl(login_name, 0)),
                               upper(nvl(login_name, 0)),
                               1,
                               0),
                        1,
                        nvl(login_name, 0),
                        0)) as logname from staff b order by logname


转 http://bbs.csdn.net/topics/40458955