5. 資料庫題（以個人熟悉資料庫為準、按要求寫出sql） （1） 計算每個人的總成績並排名(要求顯示欄位：學號，姓名，總成績) （2） 計算每個人單科的最高成績(要求顯示欄位: 學號，姓名，課程，最高成績) （3） 列出各門課程成績最好的學生(要求顯示欄位: 學號，姓名,課程，成績)   [分值：5]

use db2;

create table t_student_score(
stuid int(11),
name varchar(50),
subject varchar(50),
score int(11)
) 
delete from t_student_score;
select * from t_student_score;

insert into t_student_score values(10001,'張三','語文',89);
insert into t_student_score values(10001,'張三','數學',95);
insert into t_student_score values(10001,'張三','外語',70);
insert into t_student_score values(10001,'李四','語文',95);
insert into t_student_score values(10001,'李四','數學',80);
insert into t_student_score values(10001,'李四','外語',75);
insert into t_student_score values(10001,'王五','語文',85);
insert into t_student_score values(10001,'王五','數學',90);
insert into t_student_score values(10001,'王五','外語',70);

select  stuid 學號, name 姓名,sum(score) 總成績 from t_student_score group by name order by 總成績 ;

select  t1.stuid 學號,t1.name 姓名,t1.subject 課程,t1.score 成績 from t_student_score t1,
  (select name,max(score) 最高成績 from t_student_score group by name)t2
  where t1.name=t2.name and t1.score=t2.最高成績;


select t1.stuid 學號,t1.name 姓名,t1.subject 課程,t1.score 成績 from t_student_score t1,
 (select subject,max(score) 最高成績 from t_student_score group by subject) t2
 where t1.subject=t2.subject and t1.score=t2.最高成績;