SQL行列互换很方便

标签：sql   行列转换   

---行转列--pivot
create table tempTable
(
 id int primary key identity(1,1),
 Student nvarchar(36),
 [Subject] nvarchar(36),
 Score int,
)

select * from tempTable
insert into tempTable values (‘张三‘,‘语文‘,‘90‘)
insert into tempTable values (‘张三‘,‘语文‘,‘89‘)
insert into tempTable values (‘李四‘,‘语文‘,‘90‘)
insert into tempTable values (‘王五‘,‘语文‘,‘93‘)
insert into tempTable values (‘张三‘,‘数学‘,‘89‘)
insert into tempTable values (‘李四‘,‘数学‘,‘79‘)
insert into tempTable values (‘王五‘,‘数学‘,‘88‘)
insert into tempTable values (‘张三‘,‘英语‘,‘87‘)
insert into tempTable values (‘李四‘,‘英语‘,‘94‘)
insert into tempTable values (‘王五‘,‘英语‘,‘96‘)

select Student,sum(语文)as 语文,sum(数学) as 数学,sum(英语) as 英语  into tempsubject from tempTable pivot(avg(Score) for [Subject] in (语文,数学,英语)) as A group by Student order by 语文 desc

---列转行unpivot
select * from tempsubject
unpivot
(
 Score for [Subject] in(语文,数学,英语)
)
as f

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SQL行列互换很方便

标签：sql   行列转换   

原文地址：http://5090844.blog.51cto.com/5080844/1615243