题目
To store English words, one method is to use linked lists and store a word letter by letter. To save some space, we may let the words share the same sublist if they share the same suffix. For example, loading and being are stored as showed in Figure …
卸载好注册表,然后安装11g 每次在执行orderby的时候相当于是做了全排序,思考全排序的效率 会比较耗费系统的资源,因此选择在业务不太繁忙的时候进行
--给表添加注释
comment on table emp is 雇员表
--给列添加注释;
comment on column emp.empno is 雇员工号;select empno,en…