SQL when then实战练习

select studentId,
		语文=max(case
	    when [courseName]='语文'  then [score]
	end),
		数学=max(case
	    when [courseName]='数学'  then [score]
	end),
		英语=max(case
	    when [courseName]='英语'  then [score]
	end)
from TblScore2
group by studentId

建库

create table TblScore2
(
auotId int identity primary key not null,
studentId int not null,
courseName nvarchar(32) null,
score int null,
)
go 


insert into TblScore2 values(001,N'语文',90)
insert into TblScore2 values(001,N'数学',99)
insert into TblScore2 values(001,N'英语',95)
insert into TblScore2 values(002,N'语文',80)
insert into TblScore2 values(002,N'数学',89)
insert into TblScore2 values(002,N'英语',91)
insert into TblScore2 values(003,N'语文',86)
insert into TblScore2 values(003,N'数学',92)
insert into TblScore2 values(003,N'英语',77)

select * from TblScore2