IN操作符
      select * from scott.emp where empno=7369 or empno=7566 or empno=7788 or empno=9999;
      select * from scott.emp where empno IN (7369,7566,7788,9999);
      select * from scott.emp where  NOT IN (7369,7566,7788,9999);  相反

复习:
        找出佣金高于薪金的百分之60的员工。
        select * from scott.emp where comm>sal*0.6;

04-28 00:26