MySQL日常语句练习——单表DDL_DML_DQL语句练习

前言

数据库名称【schoolDB】,字符集【utf8_general_ci】。

1.建表语句——DDL

CREATE TABLE `student` (
  `id` int(11) NOT NULL COMMENT '学号',
  `creatDate` datetime DEFAULT NULL COMMENT '创建时间',
  `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` char(2) DEFAULT NULL COMMENT '性别',
  `introduce` varchar(255) DEFAULT NULL COMMENT '简介',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

 2.插入语句——DML

insert into student values(0,'2024-02-25 10:00:00','刘德华','123654','15612345678',62'男','永远的男神,爱你一万年，爱你经得起考验。');
insert into student values(0,'2024-02-25 10:00:00','刘青云','123154','15612345678',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','123624','15612345678',61,'男','所有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','122654','15612345678',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','223654','15612345678',27,'女','你再美你能比过王祖贤吗？');
insert into student (userName,age,introduce)values('刘亦菲',37,'神仙姐姐');

3.基础查询语句—— DQL

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