MySQL创建数据库自行创建,
数据库名称可以为【schoolDB】,字符集【utf-8】,排序规则【utf8_general_ci】.
1、学生表
CREATE TABLE `xxx` (
`id` int(11) NOT NULL AUTO_INCREMENT COMMENT '学号',
`createDate` date DEFAULT NULL,
`userName` varchar(20) DEFAULT NULL,
`pwd` varchar(36) DEFAULT NULL,
`phone` varchar(11) DEFAULT NULL,
`age` tinyint(3) DEFAULT NULL,
`sex` char(2) DEFAULT NULL,
`introduce` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
2、插入学生信息
INSERT INTO xxx VALUES(0,'2024-02-25 10:00:00','赵灵儿','123','15645623156',16,'女','逍遥哥哥,你终于找到我了。');
INSERT INTO xxx VALUES(0,'2024-02-25 10:00:00','王语嫣','123','15645623156',17,'女','慕容复,我和你不共戴天。');
INSERT INTO xxx VALUES(0,'2024-02-25 10:00:00','龙姑娘','123','15645623156',22,'女','我想过过过儿过过的日子。');
INSERT INTO xxx VALUES(0,'2024-02-25 10:00:00','杨过','123','15645623156',18,'男','一遇杨过误终身。');
INSERT INTO xxx VALUES(0,'2024-02-25 10:00:00','杨逍','123','15645623156',27,'男','杨过跟程英的大儿子。');
INSERT INTO xxx (userName,age,introduce)values('黄衣女子',26,'杨过与龙姑娘的大女儿。');
实际效果:
筛选
#基础查询
select * from xxx;
#筛选列(匿名)与筛选数据行
select userName as 姓名,age '年龄',sex '性别',introduce '简介'from xxx
where pwd is not null;
#分页limit有两个重载函数常用
#1、一个参数显示条数
#2、一个参数为从那条开始查询(下标0开始计算),零一参数为显示条数
select * from xxx limit 4,2;
#排序,order by 根据数值类型进行排序会比较准确
select * from xxx order by age desc limit 3;
#去重语句distinct
select distinct sex '性别类型' from xxx;