SELECT student_num,student_name FROM student_score WHERE course_score
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SELECT stu_no FROM student_course WHERE course_no IN (SELECT course_no FROM student_course WHERE stu_no=01
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centos定时备份mysql数据库并删除过期的（自己设定）备份
新建 mysql_autobackup.sh脚本，内容如下
```
#!/bin/bash
/usr/bin/mysqldump -uus
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SELECT * FROM student WHERE score
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SELECT teacher,AVG(score) AS avg_score
FROM course
GROUP BY teacher
ORDER BY avg_score DESC;
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SELECT s.*,c.score
FROM student s
INNER JOIN course c
ON s.s_id=c.s_id
ORDER BY c.score DESC
LIMIT 1,
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```
select stu_id,stu_name,AVG(score) from student inner join score on student.stu_id=score.stu_id where sco
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