MySQL连表查询

Posted 2020-11-30 Mr小zhou

mysql多表操作：

　　以学生表、成绩表和考勤表为例：

　　1、创建数据库：

　　　　create database 数据库;

　　连表学生总成绩降序排列：

　　　　select score.g_id,student.name,score.total from student,score where score.s_id=student.s_id order by score.total desc;

　　从成绩表中和学生表中找总成绩最高的学生：

　　select 成绩表.g_id,学生表.name,成绩表.total from 学生表 inner join 成绩表 on 学生表.s_id=成绩表.s_id group by 学生表.s_id order by max(成绩表.total) desc limit 1;
　　select score.g_id,student.name,score.total from student,score where score.s_id=student.s_id order by score.total desc limit 1;