SQL Server 中行转列 列转行

行转列：

Create database Test
on primary (
    name='Test.mdf',
    fileName='D:\\project\Test.mdf',
    size=10mb,
    fileGrowth=15%
)
log on(
    name='Test.ndf',
    fileName='D:\\project\Test.ldf',
    size=3mb,
    fileGrowth=15%
)
go
use Test
go
create table Score(
    ID int primary key identity(1,1),
    name varchar(20) not null,
    course varchar(5),
    scores numeric(5,0)
)
go
drop table Score

insert into Score
Select '张三','语文',90.2union
Select '张三','数学',85.7union
Select '张三','英语',75union
Select '李四','语文',55union
Select '李四','英语',40union
Select '李四','数学',59union
select '王五','语文',60union
select '王五','数学',70union
select '王五','英语',30


1.通过Case  where  条件1 then  结果1     多分支语句
select name as 姓名,SUM(case when course='语文' then scores else 0 end) as 语文成绩
,SUM(case when course='数学' then scores else 0 end) as 数学成绩
,SUM(case when course='英语' then scores else 0 end) as 英语成绩
 from Score group by name

2.通过pivot

select * from Score
 pivot(max(scores) for course in(语文,数学,英语)) b

列转行：

1.UNPIVOT

CREATE TABLE pvt (VendorID int, Emp1 int, Emp2 int,
    Emp3 int, Emp4 int, Emp5 int);
GO
INSERT INTO pvt VALUES (1,4,3,5,4,4);
INSERT INTO pvt VALUES (2,4,1,5,5,5);
INSERT INTO pvt VALUES (3,4,3,5,4,4);
INSERT INTO pvt VALUES (4,4,2,5,5,4);
INSERT INTO pvt VALUES (5,5,1,5,5,5);
GO
--Unpivot the table.
SELECT VendorID, Employee, Orders
FROM
   (SELECT VendorID, Emp1, Emp2, Emp3, Emp4, Emp5
   FROM pvt) p
UNPIVOT
   (Orders FOR Employee IN
      (Emp1, Emp2, Emp3, Emp4, Emp5)
)AS unpvt;
GO