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public class Hello{    public static void main(String args[])    {        System.out.println("Hello,world!");   &nb...

1.创建表stucreate table stu(sid number,sname varchar2(2),ssex varchar2(2)); 2.显示表describe studesc stu; 3.把sid设为主键alter table stu modify sid primary key; 4.修改sna...