sql纵向表转成横向表

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','张三','语文',60);
insert into @tab(Class,Student,Course,Grades) values('A班','张三','数学',70);
insert into @tab(Class,Student,Course,Grades) values('A班','张三','英语',80);
insert into @tab(Class,Student,Course,Grades) values('A班','李四','语文',30);
insert into @tab(Class,Student,Course,Grades) values('A班','李四','数学',40);
insert into @tab(Class,Student,Course,Grades) values('A班','李四','英语',50);
insert into @tab(Class,Student,Course,Grades) values('B班','王五','语文',65);
insert into @tab(Class,Student,Course,Grades) values('B班','王五','数学',75);
insert into @tab(Class,Student,Course,Grades) values('B班','王五','英语',85);
insert into @tab(Class,Student,Course,Grades) values('B班','赵六','语文',35);
insert into @tab(Class,Student,Course,Grades) values('B班','赵六','数学',45);
insert into @tab(Class,Student,Course,Grades) values('B班','赵六','英语',55);

select * from @tab

select
    (case when Grouping(Class)=1 then '总平均' 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(语文) as decimal(7,2)) as 语文
    ,cast(avg(数学) as decimal(7,2)) as 数学
    ,cast(avg(英语) as decimal(7,2)) as 英语
    ,cast(avg(总分) as decimal(7,2)) as 总分
from (
    select Class,Student
    ,(select isnull(sum(Grades),0) from @tab where class="t".Class and Student=t.Student and Course='语文') as '语文'
    ,(select isnull(sum(Grades),0) from @tab where class="t".Class and Student=t.Student and Course='数学') as '数学'
    ,(select isnull(sum(Grades),0) from @tab where class="t".Class and Student=t.Student and Course='英语') as '英语'
    ,(select isnull(sum(Grades),0) from @tab where class="t".Class and Student=t.Student) as '总分'
    from @tab as t
    group by Class,Student
    ) as tempTab
group by Class,Student,语文,数学,英语,总分 with rollup
having Grouping(语文)=1
    and Grouping(数学)=1
    and Grouping(英语)=1

SQL语句之普通行列转换

假设有张学生成绩表(Result)如下
Name Subject Result
张三语文　　73
张三数学　　83
张三
物理　　93
李四语文　　74
李四数学　　84
李四物理　　94

建表:

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

INSERT INTO TABLE1 VALUES('张三','语文','73')
INSERT INTO TABLE1
VALUES('张三','数学','83')
INSERT INTO TABLE1 VALUES('张三','物理','93')
INSERT
INTO TABLE1 VALUES('李四','语文','74')
INSERT INTO TABLE1
VALUES('李四','数学','84')
INSERT INTO TABLE1 VALUES('李四','物理','94')

想变成
姓名语文数学物理
张三 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)

如果上述两表互相换一下：即
表名(cj)
姓名语文数学物理
张三 73　　83　　93
李四 74　　84　　94

想变成

Name Subject Result
张三语文　　73
张三数学　　83
张三物理　　93
李四语文　　74
李四
数学　　84
李四物理　　94

select 姓名 as Name,'语文' as Subject,语文 as Result from CJ union
select 姓名 as
Name,'数学' as Subject,数学 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