创建表:
CREATE TABLE [dbo].[tbl_Student](
[ID] [int] IDENTITY(1,1) NOT NULL,
[学生ID] [varchar](50) COLLATE Chinese_PRC_CI_AS NULL,
[学生姓名] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NULL,
[课程ID] [nchar](10) COLLATE Chinese_PRC_CI_AS NULL,
[课程名称] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NULL,
[成绩] [int] NULL,
[教师ID] [varchar](50) COLLATE Chinese_PRC_CI_AS NULL,
[教师姓名] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NULL
) ON [PRIMARY]
插入数据:
insert into tbl_Student values(
'S3','王五','K4 ','政治',53,'T4','赵老师');
insert into tbl_Student values(
'S1',' 张三 ','K1 ','数学',61,'T1','张老师');
insert into tbl_Student values(
'S2','李四','K3 ','英语',88,'T3','李老师');
insert into tbl_Student values(
'S1',' 张三 ','K4 ','政治',77,'T4','赵老师');
insert into tbl_Student values(
'S2','李四','K4 ','政治',67,'T5','周老师');
insert into tbl_Student values(
'S3','王五','K2 ','语文',90,'T2','王老师');
insert into tbl_Student values(
'S3','王五','K1 ','数学',55,'T1','张老师');
insert into tbl_Student values(
'S1',' 张三 ','K2 ','语文',81,'T2','王老师');
insert into tbl_Student values(
'S4','赵六','K2 ','语文',59,'T1','王老师');
insert into tbl_Student values(
'S1',' 张三 ','K3 ','英语',37,'T3','李老师');
NULL
行专列
方法1:
select 学生姓名,课程ID,成绩,教师ID,教师姓名,
max(case 课程名称 when '政治' then 成绩 else 0 end) 政治,
max(case 课程名称 when '语文' then 成绩 else 0 end) 语文,
max(case 课程名称 when '数学' then 成绩 else 0 end) 数学,
max(case 课程名称 when '英语' then 成绩 else 0 end) 英语
from tbl_Student group by 学生姓名,课程ID,成绩,教师ID,教师姓名
方法2:
select *
from (select * from tbl_Student)
a pivot (max(成绩) for 课程名称 in (语文,数学,英语,政治)) b
结果如图:
列转行:
创建表:
CREATE TABLE [dbo].[tbl_列转行测试](
[UserID] [int] NULL,
[UserNo] [int] NULL,
[A] [int] NULL,
[B] [int] NULL,
[C] [int] NULL
) ON [PRIMARY]
插入数据:
UserID USERNo. A B C
1 1 11 22 33
方法1:
SELECT USERID,USERNO,tType=attribute
FROM (select * from tbl_列转行测试)a
UNPIVOT
(
value FOR attribute IN(A, B,C)
) AS UPV
结果如图: