增
insert into player values(1,'name','other');
insert into player (name,club) values ('abc','123');
外键关联查询示例：
c.* 查询的范围
player p,club c关联的两表，分别取名
p.club_id=c.id 条件1
p.name='梅西' 条件2
select c.* from player p,club c where p.club_id=c.id and p.name='梅西';
原始语句：
select club.club_name from player,club where player.club_id=club.id and player.name='梅西';
删除指定行数据
delete from onposition where id=14;
修改表里对应的值
update player set name='leo' where id = 1;
查
select * from player;
select * from player order by id;
select name,country form player;
