摘要: 单表查询 ①查询所有 * mysql> select * from student; ②查询选中字段记录 mysql> select s_name from student; ③条件查询 where mysql> select s_name from student where s_id<5; ④查 阅读全文
posted @ 2019-10-22 21:59 JackieZhengChina 阅读(108) 评论(0) 推荐(0) 编辑