oracle橫縱表相互轉換

/*縱表轉橫表*/   

create global temporary table test2

( uname varchar2(10),
subject varchar2(10),
score number
);insert into test2 values('王五','語文',80);
insert into test2 values('李四','語文',90);
insert into test2 values('李四','數學',80);
insert into test2 values('李四','英語',70);
insert into test2 values('張三','語文',80);
insert into test2 values('張三','數學',80);
insert into test2 values('張三','英語',90);
t.uname as 姓名, 
sum(case t.subject when '語文' then t.score end)as 語文,
sum(case t.subject when '數學' then t.score end)as 數學,
sum(case t.subject when '英語' then t.score end)as 英語 
from test2 t
group by t.uname;

create global temporary table test4

( uname varchar2(10),
chinese number,
math number,
english number
);insert into test4 values('張三',80,90,70);
insert into test4 values('李四',90,85,95);
insert into test4 values('王五',88,75,90);
select t.uname,'平均分' as subject,cast((t.chinese+t.math+t.english)*1.0/3 as decimal(18,2)) as score from test4 t
union all
select t.uname,'總分' as subject,(t.chinese+t.math+t.english) as score from test4 t
)tborder by uname,
case tb.subject
when 'chinese' then 1 
when 'math' then 2 
when 'english' then 3 
when '平均分' then 4
when '總分' then 5
新增上計算總分和平均分
sql語句最後加上case相當於排序。
 
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