manba日常语句练习

前言

数据库名称可以为【schoolDB】，字符集【utf8】，排序规则【utf8-general-ci】。

1.建表语句——DDL

CREATE TABLE `student` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '学号',
  `createDate` datetime DEFAULT NULL COMMENT '建立时间',
  `userName` varchar(20) DEFAULT NULL COMMENT '用户名',
  `pwd` varchar(36) DEFAULT NULL COMMENT '密码',
  `phone` varchar(11) DEFAULT NULL COMMENT '手机号',
  `age` tinyint(3) DEFAULT NULL COMMENT '年龄',
  `sex` varchar(2) DEFAULT NULL COMMENT '性别',
  `introduce` varchar(255) DEFAULT NULL COMMENT '简介',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=17 DEFAULT CHARSET=utf8;

2.插入语句——DML

INSERT INTO student VALUES(0,'2024-02-25 10:00:00','刘德华','123456','15632145678',62,'男','永远的男神，爱你一万年。');
INSERT INTO student VALUES(0,'2024-02-25 10:00:00','李青云','123456','15632147894',65,'男','真正的演员，好角色用心演绎。');
INSERT INTO student VALUES(0,'2024-02-25 10:00:00','周星驰','123456','15632147895',61,'男','所以的电影都没有对爱情有过轻视。');
INSERT INTO student VALUES(0,'2024-02-25 10:00:00','张翰','123456','15632147896',32,'男','一起坐死在流星雨下。');
INSERT INTO student VALUES(0,'2024-02-25 10:00:00','王祖贤','123456','15632147894',27,'女','你再美你能比过王祖贤吗？');
INSERT INTO student VALUES(0,'2024-02-25 10:00:00','','123456','15632147894',65,'男','真正的演员，好角色用心演绎。')；
INSERT INTO student (userName,age,introduce)VALUES('刘亦菲',37,'神仙姐姐');

3.基础查询语句——DKL

select * from student;
select userName,age,introduce
from student
where pwd is not null;
select distinct sex '性别类型' from student;
select userName as '姓名',age '年龄',introduce'简介'from student order by age desc;
select*from student limit 2;
select*from student limit 4,2