select * from 表名 order by 字段名  desc   //降序

select * from 表名 order by 字段名  asc   //升序

 

降序:

select * from emp order by empid desc;   //按empid这一列的值降序来排列查询出emp表

升序:

select * from emp order by age asc;   //按age这一列的值升序来排列查询出emp表 

select * from emp order by age ;  //默认为升序