SQL-统计查询

 数据库表以下：

CREATE TABLE `stuscore` (   
  `id` int(11) NOT NULL auto_increment,   
  `name` varchar(20) default NULL,   
  `subject` varchar(20) default NULL,   
  `score` varchar(20) default NULL,   
  `stuid` varchar(10) default NULL,   
  PRIMARY KEY  (`id`)   
) ENGINE=InnoDB DEFAULT CHARSET=utf8;   
  
/*Data for the table `stuscore` */   
  
insert  into `stuscore`(`id`,`name`,`subject`,`score`,`stuid`) values    
(1,'张三','数学','89','1'),   
(2,'张三','语文','80','1'),   
(3,'张三','英语','70','1'),   
(4,'李四','数学','90','2'),   
(5,'李四','语文','70','2'),   
(6,'李四','英语','80','2');

答案以下：