sql縱向表轉成橫向表

declare @tab table(Class varchar(20),Student varchar(20),Course varchar(50),Grades decimal(7,2));
insert into @tab(Class,Student,Course,Grades) values('A班','張三','語文',60);
insert into @tab(Class,Student,Course,Grades) values('A班','張三','數學',70);
insert into @tab(Class,Student,Course,Grades) values('A班','張三','英語',80);
insert into @tab(Class,Student,Course,Grades) values('A班','李四','語文',30);
insert into @tab(Class,Student,Course,Grades) values('A班','李四','數學',40);
insert into @tab(Class,Student,Course,Grades) values('A班','李四','英語',50);
insert into @tab(Class,Student,Course,Grades) values('B班','王五','語文',65);
insert into @tab(Class,Student,Course,Grades) values('B班','王五','數學',75);
insert into @tab(Class,Student,Course,Grades) values('B班','王五','英語',85);
insert into @tab(Class,Student,Course,Grades) values('B班','趙六','語文',35);
insert into @tab(Class,Student,Course,Grades) values('B班','趙六','數學',45);
insert into @tab(Class,Student,Course,Grades) values('B班','趙六','英語',55);

select * from @tab

select
    (case when Grouping(Class)=1 then '總平均' when Grouping(Student)=1 then '' else Class end ) as Class
    ,(case when Grouping(Class)=1 then '' when Grouping(Student)=1 then '平均' else Student end) as Student
    ,cast(avg(語文) as decimal(7,2)) as 語文
    ,cast(avg(數學) as decimal(7,2)) as 數學
    ,cast(avg(英語) as decimal(7,2)) as 英語
    ,cast(avg(總分) as decimal(7,2)) as 總分
from (
    select Class,Student
    ,(select isnull(sum(Grades),0) from @tab where class="t".Class and Student=t.Student and Course='語文') as '語文'
    ,(select isnull(sum(Grades),0) from @tab where class="t".Class and Student=t.Student and Course='數學') as '數學'
    ,(select isnull(sum(Grades),0) from @tab where class="t".Class and Student=t.Student and Course='英語') as '英語'
    ,(select isnull(sum(Grades),0) from @tab where class="t".Class and Student=t.Student) as '總分'
    from @tab as t
    group by Class,Student
    ) as tempTab
group by Class,Student,語文,數學,英語,總分 with rollup
having Grouping(語文)=1
    and Grouping(數學)=1
    and Grouping(英語)=1

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SQL語句之普通行列轉換

假設有張學生成績表(Result)如下
Name Subject Result
張三 語文　　73
張三 數學　　83
張三
物理　　93
李四 語文　　74
李四 數學　　84
李四 物理　　94

建表:

create TABLE TABLE1 (Name varchar(50),Subject varchar(50),Result int)

INSERT INTO TABLE1 VALUES('張三','語文','73')
INSERT INTO TABLE1
VALUES('張三','數學','83')
INSERT INTO TABLE1 VALUES('張三','物理','93')
INSERT
INTO TABLE1 VALUES('李四','語文','74')
INSERT INTO TABLE1
VALUES('李四','數學','84')
INSERT INTO TABLE1 VALUES('李四','物理','94')

想變成
姓名 語文 數學 物理
張三 73　　83　　93
李四 74　　84　　94

declare @sql varchar(4000)
set @sql = 'select Name as ' + '姓名'
select
@sql = @sql + ' , sum(case Subject when '''+Subject+''' then Result end)
['+Subject+']'
from (select distinct Subject from TABLE1) as a
set @sql =
@sql + ' from TABLE1 group by name'
exec(@sql)

如果上述兩表互相換一下：即
表名(cj)
姓名 語文 數學 物理
張三 73　　83　　93
李四 74　　84　　94

想變成

Name Subject Result
張三 語文　　73
張三 數學　　83
張三 物理　　93
李四 語文　　74
李四
數學　　84
李四 物理　　94

select 姓名 as Name,'語文' as Subject,語文 as Result from CJ union
select 姓名 as
Name,'數學' as Subject,數學 as Result from CJ union
select 姓名 as Name,'物理' as
Subject,物理 as Result from CJ
order by 姓名 desc