mysql -h localhost -u root -p //启用mysql
lmy1234;
show databases; //查看已存在的数据库
use (databses); //使用某个数据库
create table pet( //创建一个数据表
name varchar(20),
owner varchar(20),
species varchar(20),
sex char(1),
birth date,
death date
);
show tables; //查看数据表
describle pet; //查看数据表结构
INSERT INTO pet VALUES('Fluffy','Harold','cat','f','1999-03-30','2009-10-09'); //插入数据
INSERT INTO pet VALUES('Hally','Jim','dog','m','2001-03-30','2011-11-11');
INSERT INTO pet VALUES('Woddy','Jack','bird','f','2003-03-30',null);
select * from pet where name = 'Fluffy'; //按条件查找
select * from pet where name = 'Woddy' and sex = 'm'; //多条件和查找
select * from pet where name = 'Woddy' or sex = 'm'; //多条件或查找
select name,birth from pet where birth >='2000-1-1'; //特定的条件查找
select name,birth,species from pet where sex = 'm' order by birth; //按此顺序查找
select name,(TO_DAYS(NOW())-TO_DAYS(BIRTH))/365 as age from pet; //按年龄查找
select count(*) from pet ; //查询记录数
select count(*) from pet where sex = 'm'; //按性别查询记录数
在学习中遇到mysql 版本不匹配的问题，mysql_front不能打开.sql的文件/
