create database Inter_Transformation
go
create table Tb
(
Uname varchar(30),
Course varchar(30),
Fraction int
)
go
insert into tb values('张三','语文',74)
insert into tb values('张三','数学',83)
insert into tb values('张三','物理',93)
insert into tb values('李四','语文',74)
insert into tb values('李四','数学',84)
insert into tb values('李四','物理',94)
insert into tb values('王五','语文',null)
insert into tb values('王五','数学',84)
insert into tb values('王五','物理',94)
go
select * from Tb
go
select Uname,
MAX(case Course when'语文'then Fraction else 0 end)语文,
MAX(case Course when'数学'then Fraction else 0 end)数学,
MAX(case Course when'物理'then Fraction else 0 end)物理
from tb
group by Uname