摘要: 1.单表查询 单表无条件查询 select * from department; //查询所有属性列 select sno from sc; //查询部分属性列 select distinct sno from sc; //查询没有重复行数据的属性列 单表带条件查询 select sname fro 阅读全文
posted @ 2021-04-06 15:42 bonel 阅读(185) 评论(0) 推荐(0)