MYSQL单表操作学习之DDL、DML及DQL语句示例

CREATE TABLE `student` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '编号',
  `ceateDate` datetime DEFAULT NULL COMMENT '创建时间',
  `userName` varchar(20) COLLATE utf8_icelandic_ci DEFAULT NULL COMMENT '姓名',
  `pwd` varchar(36) COLLATE utf8_icelandic_ci DEFAULT NULL COMMENT '密码',
  `phone` varchar(11) COLLATE utf8_icelandic_ci DEFAULT NULL COMMENT '手机号',
  `age` tinyint(3) DEFAULT NULL COMMENT '年龄',
  `sex` char(2) COLLATE utf8_icelandic_ci DEFAULT NULL COMMENT '性别',
  `introduce` varchar(255) COLLATE utf8_icelandic_ci DEFAULT NULL COMMENT '简介',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=19 DEFAULT CHARSET=utf8 COLLATE=utf8_icelandic_ci;

insert into student values (0,'2022-02-02 10:10:10','葫芦娃爷爷','123123','1234567690',69,
'男','葫芦娃爷爷，在穿山甲的帮助下找到了葫芦籽');
insert into student values (0,'2022-02-02 10:10:10','蛇精','123123','1234566890',66,
'女','那个坏女人，绑架了葫芦娃');
insert into student values (0,'2022-02-02 10:10:10','蜈蚣精','123123','1234567860',67,
'男','那个坏男人，绑架了葫芦娃们');
insert into student values (0,'2022-02-02 10:10:10','一娃','123123','1634567890',23,
'男','金刚娃');
insert into student values (0,'2022-02-02 10:10:10','二娃','123123','1236567890',26,
'男','水娃');
insert into student values (0,'2022-02-02 10:10:10','三娃','123123','1234567896',24,
'男','拿个破葫芦');

insert into student (userName,age,introduce) VALUES('山神',25,'孕育了葫芦娃兄弟')
select * from student

SELECT userName as '用户名',age 年龄,sex'性 别',introduce'简介' from student
where pwd is not 123123;
SELECT distinct sex '性别类型' from student;
SELECT * from student order by userName desc;
SELECT * from student limit 5,3;