MySQL添加、更新、删除数据

1、查询数据

select * from student;

2、添加数据

insert into student values(1,"张三","男",23,'1999-12-23','Java001','zhangsan@qq.com');

可以添加两条相同的数据，因为没有创建相应的约束constraint

insert into student values(1,"张三","男",23,'1999-12-23','Java001','zhangsan@qq.com');

也可以添加指定位置的数据，其他位置默认为空

insert into student (sno,name,sex,classname)values (3,"王五","男","Java002");

日期有多种写法，具体可以看我上一篇博客https://blog.csdn.net/qq_48759664/article/details/115578645

insert into student values(2,'李四','男',24,"1999/12/23","Java001","lisi@qq.com");

3、修改数据

update student set sex='女' where sno=2;

4、删除数据

delete from student where email is null;

删除数据库表student中所有数据