同样也是用于记录以便日后联系用！里面基本包含了一般sql的高级用法！

drop table if exists stu;
create table stu(
name varchar(30),
age int,
stuid int not null PRIMARY key AUTO_INCREMENT,
idnum int,
sex varchar(30),
check(sex in ('男','女'))
)charset=utf8;

insert into stu (name,age,idnum,sex)VALUES('damon',789,4678945,'男');
insert into stu (name,age,idnum,sex) VALUES('coco',13,345,'女');
insert into stu (name,age,idnum,sex)values('kitty',13,46,'女');
insert into stu (name,age,idnum,sex)values('alice',14,123,'女');
SELECT * from stu;
select * from stu limit 0,2;
select * from stu where name like '%ce';
select * from stu where name REGEXP "a[sfdl][^ads]";
select * from stu where name in ('damon','alice');
select * from stu where name BETWEEN 'coco' and 'kitty'; 
select * from stu where name not between 'coco' and 'kitty';
select name as stuname,stuid as id from stu;

drop view if EXISTS young_stu;
create view young_stu as
select name,age from stu where age between 10 and 20;

select * from young_stu where age is not null;

后面会再记录一章专门使用sql函数。