常见的sql操作

Posted 2021-01-04 某个润滑君

查询所有14岁到18岁之间的男学生，并输出他们的姓名和年龄：<br>Select Name, Age From<br>student Where sex = ‘male’ and age between 14 and 18

查询所有姓名包含“妍”的学生：<br>Select * From student<br>Where name like “%妍%”

统计表中学生涉及的院系个数：<br>Select<br>count（*）From (Select distinct Dept From student)

统计表中不同系别的男生的平均年龄，并按从大到小排列：<br>Select Dept, avg(Age)<br>From student Where sex = ‘male’ Group by Dept Order by avg(Age)