如何把sqlserver中的列转换成行，行转换成列，显示

create database arron

go

use arron

go

– createTable init Data

create table students (

name varchar(25),

class varchar(25),

grade int

)

insert into students values (‘张三’,’语文’,20)

insert into students values (‘张三’,’数学’,90)

insert into students values (‘张三’,’英语’,50)

insert into students values (‘李四’,’语文’,81)

insert into students values (‘李四’,’数学’,60)

insert into students values (‘李四’,’英语’,90)

– solution1

select * from students

pivot(

max(grade)

FOR [class] IN ([语文],[数学],[英语])

) AS pvt

– solution2 相当于自连接

select A.Name,A.grade as 语文,B.grade as 数学,C.grade as 英语

from students A,students B,students C

where A.Name=B.Name and B.Name=C.Name

and A.class=’语文’ and B.class=’数学’

and C.class=’英语’

– solution3

select name,

max(case when s.class=’语文’ then s.grade end) as 语文,

max(case when s.class=’数学’ then s.grade end) as 数学,

max(case when s.class=’英语’ then s.grade end) as 英语

from students s group by name

–在有id 的情况下

create table students2 (

id int primary key identity(1,1),

name varchar(25),

class varchar(25),

grade int

)

insert into students2 values (‘张三’,’语文’,20)

insert into students2 values (‘张三’,’数学’,90)

insert into students2 values (‘张三’,’英语’,50)

insert into students2 values (‘李四’,’语文’,81)

insert into students2 values (‘李四’,’数学’,60)

insert into students2 values (‘李四’,’英语’,90)

– 原先的solution1(有问题)

select * from students2

pivot(

max(grade)

FOR [class] IN ([语文],[数学],[英语])

) AS pvt

– 原先的solution2 (ok)

select A.Name,A.grade as 语文,B.grade as 数学,C.grade as 英语

from students A,students2 B,students2 C

where A.Name=B.Name and B.Name=C.Name

and A.class=’语文’ and B.class=’数学’

and C.class=’英语’

– 原先的solution3 （ok）

select name,

max(case when s.class=’语文’ then s.grade end) as 语文,

max(case when s.class=’数学’ then s.grade end) as 数学,

max(case when s.class=’英语’ then s.grade end) as 英语

from students s group by name

–unpivot 函数使用

create table test1(id int,name varchar(20), Q1 int, Q2 int, Q3 int, Q4 int)

insert into test1 values(1,’a’,1000,2000,4000,5000)

insert into test1 values(2,’b’,3000,3500,4200,5500)

–实现的sql

select * from test1

select id ,[name],[jidu],[xiaoshou] from test1

unpivot

(

xiaoshou for jidu in

([q1],[q2],[q3],[q4])

)

as f

— 以下的sql 可以替换上面的sql

select id,[name],

jidu=’Q1’,

xiaoshou=(select Q1 from test1 where id=a.id)

from test1 as a

union

select id,[name],

jidu=’Q2’,

xiaoshou=(select Q2 from test1 where id=a.id)

from test1 as a

union

select id,[name],

jidu=’Q3’,

xiaoshou=(select Q3 from test1 where id=a.id)

from test1 as a

union

select id,[name],

jidu=’Q4’,

xiaoshou=(select Q4 from test1 where id=a.id)

from test1 as a

转自：http://m.blog.csdn.net/article/details?id=9138053

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