• DML英文全称是Data Manipulation Language（数据操作语言），用来对数据库中表的数据记录进行增删改等操作

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 DML-添加数据

insert into employee(id, workno, name, gender, age, idcard) values (1,'1','Itcast','男',10,'123456789012345678');

select * from employee;

insert into employee values (2,'2','喜洋洋','男',18,'123456781212345678');

insert into employee values (3,'3','熊大','男',38,'123453489012345678'),(4,'4','光头强','男',44,'123456219012345678');

 DML-修改数据

-- 修改id为1的数据, 将name修改为itheim
update employee set name = 'itheim' where id = 1;

-- 修改id为1的数据, 将name修改为小红 , gender 修改为女
update employee set name = '小红' , gender = '女' where id = 1;

 DML-删除数据

-- 删除 gender 为女的员工
delete from employee where gender = '女';

-- 删除所有员工
delete from  employee;

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总结