摘要: 1、order by 排序 select * from employee order by salary ASC limit 10; //查询出按salary排序最低的的10,名员工 2.distinct 获取不重复的唯一值 select distinct first_name from emplo 阅读全文
posted @ 2019-07-29 16:10 D_戴同学 阅读(484) 评论(0) 推荐(0) 编辑