我要评论数据库名称为【schoolidb】，字符集【utf8】，排序规则【utf8_general_ci】.
1、创建数据表——dll语句
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;
2、插入数据——dml语句
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 student3、编辑语句——dql
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;
总结
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